Artillery bombardment then began between the two forces, and continued for an hour until the Russians mounted a frontal assault against the Swedish positions. Kulnev, on the Russian left wing, struck the Swedish right, but was repelled when his force became bogged down in the Fjärdså stream. The Russians now reinforced their right wing, under Nikolay Demidov, and another assault was made. It was also repelled, but this time the Swedish unexplainably left their positions and counterattacked; Adlercreutz had issued no order to that effect. The Swedish counterattack met overpowering fire and was forced to withdraw with heavy losses.