>>64173050 (OP)
I don't think any army that would willingly attack through terrain that just straight up eats some people and the vehicles carrying their supplies, whilst giving the vast majority horrific diseases and leaving every single one of them mentally and physically exhausted if there's a better option available.
And that's if they manage to make it out of there in a single day.
I honestly think swamps are worse to deal with than jungles are, because at least you have a chance of finding food in the jungle and you can reliably be sure about the condition of the ground your treading on, unlike with a swamp where that innocuous lump of grass could be a solid clump of dryish land or it could be an inch of dryish crust that's concealing a 6ft deep quagmire.
You don't even get a break from the bugs when you're moving through one in summer and the bastard things seem to have a thing about biting you on your ankles and other places you have to keep covered up, so the bites end up turning into sores from the constant chafing and lack of air, because if you give them the air and clearance they need, the bugs just start biting you there again.
