If your Tauren is a front line kind of guy, He needs the equipment that would benefit that kind of combat. This will range from the same stuff as seen throughout history, but some is going to be specific to his race.
For the Typical:
A pike. You want to poke the other guy before he can poke you. A tried and true weapon.
A short sword. He's going to be in the thick of things. Big wild swinging weapons are dangerous to your friends right next to you, not to mention that a big swing takes time. Something short and sharp when you are in the middle of a crowd will be more helpful. After all, the Roman Gladius was hugely effective in infantry actions for hundreds of years.
Now the not so typical:
Shield. Again think Roman legionary, but notched to account for your Tauren's head. Give it a large-ish central conical spike as well. Your guy is stronger than a human, so as he pushes forward into the enemy line this could help turn the enemy shields inward, opening them up to be poked with sharp things. It will also help protect his chest.
Helm. It should protect his forehead as well as the base of his horns, if not the entire horn. Give the horns some edges as well as sharper points. A toss of his very strong neck would be a decent slashing attack.
Armor. He will need a fitted breastplate of course, but his sides will need to heavily protected as well. If he is pushing into and through an enemy line, his sides will be exposed to all manner of sharp things. His backplate will need to be heavy and will need to protect the back of his neck and shoulders, probably more than a human soldier. If the head is that far forward, an overhand swing with a long weapon might well impact the back of his neck.
Leg protection. Armor for his lower leg and ankles is critical. The shape of the back legs of hoofed animals means that they are pretty vulnerable to lateral type impacts. One enemy with a heavy shield might be able to smash down and sideways into those small bones above and behind the hoof and cripple the Tauren. He is also going to be vulnerable to hamstringing and damage to the Achilles heel (or bovine equivalent), so protect that as best you can without sacrificing too much range of motion.