Battle of Ümera () or Battle of Imera () recorded by Henry of Latvia was fought near Valmiera () on the Ümera river in 1210, during the Livonian Crusade between Estonians and Crusaders. The Estonians won the battle. The Estonian troops moved across the Koiva river and stopped at its tributary the next day for an ambush. The chasing Livonians and Letts assumed that their enemy was escaping with "their head over heels" which also had been confirmed by their scouts. The German squad was moving in front with the Livonians and Letts behind them.