I use 1" X 3/4" (25mm X 20mm) bases for 3 infantry, 1" square for 2 cavalry and 1" X 2" deep for artillery. This would work well enough for F&F or its distant cousin Bloody Big Battles. Infantry are mounted a mix of 2 up, 1 back or 1 up, 2 back. Looks deeper than a single rank.