On April 28, 1790, a Swedish army corps of 4000 men under the command of Gustav III and several of his closest officers crossed the Kymi River in Pörille village, at a hastily struck bridge over a ford.

The next day, they continued their march to Valkeala, where a Russian force of 3000 men stood ready to face them.

The Swedish force available for battle consisted of roughly 3000 men, since 3 battalions had been diverted to guard the ford crossing and rear positions.

After Colonel Swedenhjelm's adversity through Anjala on May 5, the Army Corps of Keltis returned the Kymi river.

Left on the battlefield there were 50 Russians killed and 70 wounded with another 40 unharmed captives of the lower rank.