Those 3 consist of an immortal elf, a dwarf who are known for their endurance yet complained the whole trip anyways, and an 85 year old Dúnedain, a race of men descended from the Númenóreans, who are known for their longevity and noble lineage. So they’re not exactly common foot soldiers.
Back when we could expect good things from our Octogenarian politicians \s.
But on a serious note, I think the supply train for the orcs was non existent as they were … expected to live off the land…
There’s a whole scene where they mutiny against their leader because they’re starving and dog tired. They want to eat the hobbits, and the only thing that stopped them was one of them getting beheaded for mutiny, and then getting decimated by a squadron of Rohan horsemen. I love that they took the time to include that, since it makes it more believable. The Uruk-hai were pushed to their absolute limits and then beyond, and they snapped, just like men would.