Heilsberg (Campaign of Friedland).
Fought June 10, 1807, between 30,000 French, under Marshal Soult, and 80,000 Russians, under General Bennigsen. The Russians occupied the heights on both sides of the Alle, and the plains below, being in greater force on the left bank. The French attacked and drove the Russians into the entrenchments, but could make no further progress, and night put an end to an obstinate but inconclusive conflict, in which the Russians lost about 10,000, the French, 8,000 killed and wounded.