Sentence:  "<WSD>Douche boats</WSD>" had two water cannons that operated at 3,000lb per square inch, and were fed by centrifugal pumps powered by a General Motors 12V-71 diesel engine, pumping 1,000 gallons (3,785 liters) per minute through each cannon - over four tons of water a minute. 
Meaning of the word marked with <WSD> tags:  A river craft outfitted with a high-pressure water cannon capable of destroying enemy encampments.