Colonel White wrote:
Particularly in the late war it was easy for tanks to spot targets even if they are hatch down. This is becasue they were littered with optical viewing instruments such as periscopes. Very later Panther Gs ( my favourite tank) were even fitted with Infra Red night viewing equipment.
Well that goes against all primary source material then... Tanks, even now are terrible to see out of when buttoned-up as evidenced by the US crews who rode out of the turrets during the Thunder Run through Baghdad.
Having been in a Panzer III M, a Tiger I, a T-34/85 and a Sherman, I can attest to how appaling vision is from all of them when buttoned up.
Simply put, if you wanted to see what was going on during a WW2 battle, you had to be out of the turret.

