Battle of Ümera
Battle of Ümera or Battle of Imera , recorded by Henry of Latvia was fought south of Valmiera , near the Gauja River in August or September 1210 , during the Livonian Crusade between Crusaders and Estonians . 
<triplet> Battle of Ümera <subj> Livonian Crusade <obj> part of <triplet> Livonian Crusade <subj> Estonians <obj> participant