26.5.1831 battle of Ostrolenka
party1: insurgent Poles
commander1: Jan Skrnzneki/Skrzynecki
troops1: 32000
losses1: 7000+2000
party2: Russians
commander2: Graf Diebitsch
troops2: 38000
losses2: 4500+500
(Victory of insurgent Poles or (perhaps) indecisive)
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