The Japanese yesterday took complete control at Shanghai, sank with all hands one of our small river gunboats, the Petrel, and seized an American gunboat.

日本昨天完全控制了上海，击沉了我方1艘水手满员的小型内河炮艇海燕号，并夺取了另外1艘美国炮艇。

youdao

In the same year, Japanese planes sank an American gunboat in the Yangtze River in China.

VOA: special.2011.05.05

As well as providing food, communication and the occasional excitement when a Colombian gunboat looking for drug smugglers sails by, the river affords the best way to cool off in the heat so long as thoughts of little organisms that swim up the urethra can be set aside.

ECONOMIST: The Amazon's indigenous people