Battle
The battle begun when the Soviet Amur Flotilla attacked the garrisoned city of Lahasusu from the river. Soviet monitors ''Lenin'', ''Sverdlov'', ''Sun Yat-sen'' and ''Krasnyi Vostok'' and other minor units faced a Chinese flotilla of 11 units. Chinese steamer ''Kiang Tai'' suffered a direct hit, while monitor ''Lenin'' set aflame the gunboat ''Kiang Ping''. The gunboat ''Lee Ju'' managed to score hit on the Soviet gunboat ''Proletarii'' and the monitor ''Sun Yat-sen'' but was eventually hit by ''Krasnyi Vostok'' and grounded by its crew. Older sources report different transliteration of the Chinese ships, stating gunboats ''Chantai'' and ''Chanan'' sunk, followed by ''Chianping'', while the ex-German gunboat ''Lichi'' was abandoned and taken in tow by Soviets. The army transport steamer n°18 and seven barges were also seized. While the Soviet side suffered human casualties (17 men), they lost no ship.Aftermath
With the river battle still ongoing, other Soviet ships successfully landed troops close to Lahasusu and defeated the local garrison. As was common practice for the Soviets during this conflict, Soviet troops opened the grain stores of the city to distribute grain to the population to win their support. It was a heavy defeat for the Chinese, that were forced to gather their defense at Fushin: there the rest of the Chinese fleet was destroyed.References
{{Reflist Lahasusu Lahasusu 1929 in military history Lahasusu