Tank Crew TC question

I was playing Tank Crew last night and when I put the driver in auto drive (A) I can then move to the TC position and give orders to the Platoon via the ` key and F menu system.

But I noticed in a couple of mission, thou I was ordering the platoon to move and then engage a enemy convoy, they stayed back and I had to do it all myself, eventually being overwhelmed and killed.

My question… does anyone understand how the command system works, and why I was unable to get my platoon to follow orders… both missions would of been awesome if they would of just followed in formation and engaged targets when ordered.