Battle of Rain

The forces involved in this conflict were 40,000 Swedish troops under Gustavus Adolphus and 25,000 Catholic League troops under Johan Tserclaes, Count of Tilly. It was the second meeting between the two legendary generals and like at Breitenfeld, Tilly lost when Gustavus forded the river Lech under the cover of his superb artillery.

The night before the battle, Gustavus constructed a pontoon bridge across the Lech near Rain; in the morning, he sent three hundred Finnish Hakkapeliitta troops across the river under fire. Once across, the Hackapelites dug earthworks for batteries which then protected the rest of Gustavus' army as they crossed the river.

Wikipedia