In my last match He used the JP4 to destroy my base defence and then he comes with 2 JP4 and a lot of infantry. My troops were around the maps capturing and i had 2 shermans that dead very fast. I had no AT.
never heard of that one before, but in this case, If he builds two JP4s,then a build I'd recommend is
Rifle Company
3-4 Rifles
LT
2 50 Cals,or 1 50 cal and an M20.
Captain,2 AT guns. Upgrade bazookas and give one bazooka,one flamethrower(Or BAR if its a more open map) for each squad of riflemen.
f he has two JP4 as his first two vehicles early on then he wont have obers or panthers,or a KT.
which means your riflemen with all their upgrades,50 cals for insurance,and AT Guns should be a counter to this, since all he has is AT based volks,Fussiliers,and sturms. unless you really screwed up.
If Game continues to drag along call in easy 8s,which are the best medium tanks along with T34-85s if you just HAVE to engage a JP4,since they have better penetration and armor/hp. Use smoke to close the distance,come from different angles,and follow up with all your infantry and AT guns so when the Jp4's turn to engage ur shermans they are exposed to the AT guns I If thats not good enough of an explanation go ahead and post the replay if you have it, so I can see whats actually up.
You can play USF in different ways besides LT M20 rush for a sherman. When you come across a unique strategy you have to be unique as a counter.