Language in Scotland

Hi everybody, I would like to ask if there's anyone who knows what is Jamie(and the rest of the group of Highlanders) saying after this sentence:  " Now, if we have the discipline to stand together, to march together, and to fight together, then by God, I ken we will win together." I suppose it is some battle or war cry - youtube.com/watch?v=gv1wAMsI7cI&t=42s time: 00:34... Could anyone tell me what he says, what does it mean and how it is written? I would be truly thankfull! Have a nice day! :)