The Battle of Partakoski, or the Battle of Partakoski–Kärnäkoski, was fought on 30 April 1790 in the Russo-Swedish War (1788–1790). The engaged Swedish forces were led by , as part of a Swedish brigade commanded by Gustaf Mauritz Armfelt. The Russian forces opposing them was under the supreme command of Iosif Igelström, with Victor Amadeus of Anhalt-Bernburg acting as commander in the battle.
In 1790, with the aim of delivering a crushing blow, Swedish king Gustav III bolstered his naval forces for a landing operation against the Russian capital, Saint Petersburg. Several brigades were formed, one of which under Armfelt with 3,000 to 4,000 men, to simultaneously pin down their forces on land. Armfelt swiftly captured the vital Partakoski and Kärnäkoski crossings on 15 April, threatening the rear of the Russian front line at the Kymijoki. In response, Igelström concentrated 6,000 men at nearby Savitaipale to retake them.
On 30 April, while demonstrating against Armfelt's headquarters at Suomenniemi, three Russian columns launched a converged attack on Jägerhorn's position at the crossings. They were repulsed at Partakoski, but broke through the Swedish front at Kärnäkoski. As the Swedes received reinforcements, the Russians were forced to retreat with heavy losses, including mortally wounded Victor Amadeus. The Swedish brigades, however, failed to coordinate an attack, while the naval operation ended in disaster on 3 July. Only a major Swedish victory at Svensksund on 10 July paved the way for peace on 14 August 1790, resulting in status quo ante bellum.
Background
According to the Swedish military plans of 1790, offensives would commence from Savonia and Karelia to tie up Russian forces on land, while troops from their own army would reinforce the navy; the goal was to deliver a quick decisive blow by capturing Saint Petersburg in a landing operation, similar to the strategy of 1788. Accordingly, for land operations, three new brigades were formed north of the main army – one of them under Gustaf Mauritz Armfelt.
Armfelt's brigade With 3,000 to 4,000 men and 11 cannons, Armfelt was tasked with capturing Lappeenranta in a surprise offensive at the turn of February-March. The road to Lappeenranta, via Mikkeli and Ristiina, went over the Partakoski and Kärnäkoski straits, and was crucial to both sides. The crossings had been captured by a small Swedish detachment already at the outbreak of hostilities in June 1788, but were lost to a Russian counterattack the next month.
Due to various difficulties, the formation of the brigade was delayed by several weeks. Swedish King Gustav III, who personally supervised the operation, therefore settled on capturing the crossings once it finally commenced on 14 April from Ristiina. This would pull Russian troops from the front line at the Kymijoki river into Savitaipale, to defend their rear line of communication.
Swedish offensive
Opposing the Swedes were several outposts under Lieutenant Colonel Petrowitz, from General Major Suchtelen's Russian army. Petrowitz had 500 to 600 men with two cannons at the Partakoski and Kärnäkoski straits, barely 200 on Kuivasensaari, 100 at Suomenniemi, and a detachment on Laamalansaari. A plan to catch him by surprise was devised by Lieutenant Colonel , who formed a vanguard of at least 740 men to that effect. At 11:00 on 15 April, some north of Partakoski, Jägerhorn loaded his troops onto 60 sledges to gain speed. He would be followed at a distance by the main Swedish force under the king and Armfelt.
Major Fahnehjelm with a Jönköping battalion diverged left to Kuivasensaari, while Eberhard von Vegesack, spearheading the assault with the Dalarna reserve battalion, raced to Partakoski. The Swedes arrived just after noon and achieved total surprise, capturing the heights and a cannon north of the bridge. Vegesack pursued the Russians over the bridge with additional support from the Hälsinge reserves and, notwithstanding the fire from the buildings, captured the second cannon. The Swedes subsequently stormed a redoubt at the Patterinmäki hill to the southwest, while Fahnehjelm dislodged the Russians from Kuivasensaari. They made a new stand at Kärnäkoski, but were forced back to Savitaipale as soon as the Swedish main forces arrived.
Swedish losses amounted to six killed and 18 wounded. The Russians lost at least 14 killed and 39 captured, as well as two cannons and rich spoils of war. Armfelt and Gustav III arrived only after fighting had ceased. Armfelt established his headquarters at Suomenniemi, which had been abandoned by the Russians and occupied by the Swedes on 18 April. The king travelled south after the skirmish, to lead the main army's divisions in an offensive over the Kymijoki.
Staging phase With Partakoski and Kärnäkoski lost, and the centre of their operational line penetrated, the Russians abandoned any plans of a major coastal offensive in the south. Instead, they began pulling troops from the Kymijoki to secure their rear. Ivan Saltykov, the Russian commander-in-chief, tasked Iosif Igelström with retaking the crossings before the thawing of the surrounding waters, and the Swedish fortifications became too formidable.
Swedish defences
On the day of battle, Jägerhorn was entrusted the overall command at Partakoski and Kärnäkoski with 1,400 men. He led nearly half of them in the centre, at Partakoski and the Patterinmäki redoubt, in two weak Närke-Värmland battalions and two cannons. Vegesack led the front, with his left wing defending the Kärnäkoski bridge with 120 Värmlanders and three cannons in a breastwork, south-southeast of Partakoski. About 480 Dalarna and Hälsinge reserves and a cannon formed his right wing, south where the strait widened. Their jäger detachments held Lapinsalo (north of Partakoski), while pickets guarded Ratasalo and Parranniemi, southwest and west of Partakoski, respectively.
Armfelt was headquartered at Suomenniemi, northwest of Partakoski, where a third Närke-Värmland battalion and a Tavastehus battalion with a company were garrisoned in reserve. To the left of Partakoski were two Jönköping battalions at Kuivainen, and a reinforcing Savolax battalion (200 men) on Laamalansaari, and north, respectively. The brigade also included a few Karelian dragoons, Savolax jägers, and parts of an Älvsborg battalion.
Russian plan of attack
By 29 April, 6,000 men with 21 or 22 cannons were concentrated at Savitaipale for the attack, to be led by prince Victor Amadeus of Anhalt-Bernburg. The overall plan called for a two-pronged attack on Partakoski with flanking columns, while a middle column frontally engages Kärnäkoski. Support troops would tie up Armfelt's reserve at Suomenniemi. Some 300 Cossacks were divided between the columns.
Right column: Brigadier General had six or more cannons and about 2,000 men, in two Preobrazhensky Life Guard battalions and, possibly, a few additional jäger and grenadier detachments. He would march from Suppala over the Saimaa lake, bypass Vegesack's left flank and proceed to capture the heights north of Partakoski.
Middle column: General Major Suchtelen had at least six cannons and 2,000 men, in several Yelets and Velikolutski companies and, possibly, two or more grenadier companies. Accompanied by Victor Amadeus, he would march along the main road from Savitaipale and frontally engage Vegesack's troops behind the Kärnäkoski strait.
Left columns: Prince led an advance column of two regimental guns and five Yelets companies (up to 1,000 men), to bypass Vegesack's right flank over the Kuolimo, to his southwest. Once on land, he would pave the way for the rear column under Major General for a joint attack on the Patterinmäki redoubt. Berchmann, with four cannons and two battalions (about 1,000 men), would also demonstrate against Suomenniemi to tie up the Swedish reserve. Two grenadier companies were to remain at Savitaipale to guard the army's supply train.
Battle Before midnight of 30 April, the Russian columns set off for their respective destinations; the lakes and wider sections of the straits were still frozen, while the rapid at the Kärnäkoski bridge was ice free. Jägerhorn received reports after midnight of noise coming from the lakes in several directions. At 02:00, the Ratasalo picket informed him of a Russian advance over the Kuolimo. Half an hour later, he spotted their right column on his opposite side, crossing the Saimaa to the east.
Partakoski
As the right column under Baikov deployed for battle behind the Lapinsalo and Kotkatsaari islands, the Swedes opened fire with two cannons from the shore above Partakoski. Baikov positioned his artillery and jägers on the heights at Kotkatsaari and sent a detachment to attack under their cover, which was repulsed. The Russians quickly achieved fire superiority, however, killing or wounding both of the Värmland commanding officers and many privates. The two Swedish battalions fled towards the Partakoski strait behind them, whereupon Baikov commenced a full attack.
Jägerhorn managed to restore order in his troops and initiated a counterattack, supported by an additional cannon. With the cover of a ridge, the Swedes repelled the Russians as they advanced ashore. The Savolaxers now also appeared on the ice from Kuivainen, forcing Baikov to leave a battalion in his rear before continuing the attack. Most Russian senior commanders were lost in the ensuing struggle, including the mortally wounded Baikov. Too exhausted to attack anew, the Russians withdrew to Kotkatsaari, whence they maintained a steady fire until withdrawing some time past 05:00.
During this time, Meshchersky's column crossed the Kuolimo and moved inland towards Parranniemi, west of Partakoski, forcing the Swedish picket back. Hampered by inadequate guides and difficult roads, it did not arrive in front of the Patterinmäki redoubt until around 04:00; Baikov's attack had already failed by then, while the Jönköping and Savolax battalions were arriving at Partakoski from the north. Seeing this, the Russians halted at a distance, deployed two cannons and opened fire. The Swedes, losing but a few horses as a result, replied with their own artillery from the redoubt. Jägerhorn sent forward patrols to observe the Russians.
Kuolimo
Just before 02:00, whilst crossing the Kuolimo, the left Russian columns were spotted by the Swedish picket at Ratasalo. Berchmann dislodged them with two grenadier companies under Second Major , who proceeded to attack Vegesack's force near Kärnäkoski. Berchmann sent Baron Frensdorf to Suomensalo with two companies and a cannon to screen against Suomenniemi. Four companies and three cannons remained under him between Lehtisensaari and the mainland, in coordination with Meshchersky's advance upon Partakoski.
After being informed of a Swedish advance over the ice from Suomenniemi, Berchmann marched to Frensdorf's support with two companies and as many cannons. Armfelt, however, soon realised it was just a demonstration and pulled back his forces. He directed the Närke-Värmland battalion to Partakoski, which was under heavy attack, while leaving Lieutenant Colonel at Suomenniemi with the Tavastehus battalion and five cannons. The two sides would remain passive at this section for the rest of the battle.
Kärnäkoski Suchtelen's middle column arrived opposite the Kärnäkoski breastwork around 04:00, launching a diversionary attack with jägers and two cannons. His main force engaged Vegesack's reserves across the strait, whose fire checked the initial attack. Around 05:00, two grenadier companies under Yershov arrived from Kuolimo and attacked them in the rear, taking the cannon. Suchtelen launched a simultaneous frontal assault across the ice, whereupon Vegesack's right wing buckled and withdrew. The captured cannon was used against the breastwork, which the Russians proceeded to attack from several directions.