Trawler’s equipment cut, with ship surrounded by troops – collisions avoided (4,6)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

“net”(equipment of a trawler/a boat used for fishing with a trawl net) minus its last letter ( cut ) plus ( with ) [ SS(abbrev. for “steamship”, as used in the names of such ships) contained in ( surrounded by ) ARMIES(military troops) ].