Am I really the first to post this week? On Sunday morning? That can only be because this puzzle was so easy that nobody needs any help with it!
In fact, neither do I, except that I'm niggled by the wordplay in 18. The 'grunts' are infantrymen, fair enough. But what do 'fish' and a 'river going west' have to do with the grid entry TERTA?
And what does the title mean?