1: Celtic Longsword VS Gladius

I take this is the Gladius Hispaniensis now... the early gladius was not very broad and the wounds it made, not magnificent but they could still kill... A polybian soldier was trained to aim for the guts mainly and with a slim blade, you arrent gonna hit much, now with the later Gladius Mainz was super broad and would hurt alot...
The Celtic Longsword: im just gonna say... one cut to the clavicula and you are out... not that i would like to bring that unwieldy gloryfied metaltube into battle... ;)

2: Overhand Underhand cav.
Well guys... the overhand cavalry can be good, just not for heavycav duties... use them against other cav, they stab faster with that little spear :)