When hostilities broke out, he returned to England and joined up.战事爆发后，他返回英国参了军。The authorities have urged people to stock up on fuel in case hostilities break out.当局已敦促人们储存燃料，以防战事爆发。When hostilities broke out he returned to England and joined up.战事爆发之后，他回到英格兰参军了。