Sentence:  Pa Blanken tells me that the Japs <WSD>beat up</WSD> our camp a month ago and we have lost all our heavy gear and moved up into the hills - he does not know where. Hell! No casualties, however. [...] Our material losses were very serious. The Japs had found a rucksack containing all our money, our medicines, including all our vital quinine, a copy of our signals plan, and a number of maps. ... It seems probable that the Japs spotted our camp from the air. They certainly knew its exact position and came straight to it. 
Meaning of the word marked with <WSD> tags:  To attack suddenly; to alarm.