The Battle of Rain took place on 15 April 1632 near Rain in Bavaria during the Thirty Years' War. A Swedish army under Gustavus Adolphus of Sweden defeated a Catholic League force led by Johann Tserclaes, Count of Tilly, who later died of wounds received in the battle.
Outnumbered and with many inexperienced troops, Tilly built defensive works along the River Lech, centred on the town of Rain, hoping to delay Gustavus long enough for Imperial reinforcements under Albrecht von Wallenstein to reach him. The Swedes spent 14 April bombarding the defences, then crossed the river the next day, inflicting nearly 3,000 casualties, including Tilly. On 16 April, Maximilian of Bavaria ordered a retreat, abandoning his supplies and guns.