On all the good big trench 1v1 maps, I collect and move troops in a way that I'm not leaving any stranded of course.
But when I join similar games on esc or flat rate, I will eventually end up with a card set that will give me a bonus of 2 troops on that spot. and it drives me MAD if I don't fort it forward immediately.
Of course, if you haven't met the enemy yet, this is a good idea on Feudal maps. But I have lost a few games over the many years on the site because at a critical point, I decided to fort the 2 from owning the card spot instead of forting the 11 or 16 I had on a castle