Sentence:  One <WSD>sea</WSD> broke away the spare yards and spars out of the starboard main chains. Another heavy <WSD>sea</WSD> broke into the ship and stove all the boats. Several casks of bear, that had been lashed upon deck, were broke loose and washed overboard, and it was not without great difficulty and risk that we were able to secure the boats from being washed away entirely. 
Meaning of the word marked with <WSD> tags:  The swell of the sea; a single wave; billow.