In the story I would like to write, humans temporarily fight a race of lion people.
In the story, there are two sides. Standing Alliance and the Animal Alliance (it sounds dumb, but I haven't come up with names). Standings is composed of multiple races, but the humans make up a majority of the army. Though the other races take part, there is a human only segment of the army due to the fact the other races are minorities.
The humans seem to have a bit of a disadvantage physically, so they need to have other advantages. The kind of answer I'm looking for is general strategy and tactics.
The humans have these prerequisites.
The humans make up the cavalry, infantry, and skirmishers. They man artillery such as catapults, but there are only five of them. Majority of the basic infantry wear leather, with small pieces of armor covering the chest and stomach, going around to cover the back. They also wear basic metal helmets. The cavalry is completely covered in plate armor, with leather underneath. However, there is a smaller part of that is a skirmishing cavalry. Skirmishers themselves have leather armor.
For the sake of eliminating variables, let us say they are well rounded, but not specialized in any area.
The lion people are infantry and skirmishers and sport no cavalry or artillery. They wear rough leather (I do not know if this affects the quality of protection). Males and females both fight. (Edit: removed constraint that could've inhibited an appropriate answer.)
Males are 10 to 12 feet tall, with females 7 to 8 feet tall. Males can throw a human easily, but females find this slightly difficult, not that they still can't do this. Males exhibit a helmet carved from a large nut that covers their face (so It don't splinter into their face if there is a large impact, just cushioning while breaking) and depends on their mane to protect their neck and the back of their head. Females wear a complete helmet.
The lions fight like this; males fight on the frontline while females flank. Males that fight on the frontline with attack with spears and clubs, along side with obsidian axes for the largest of them. Females fight with Macahuitl like weapons as well. Skirmishers are female and male both fire arrows with bows (albeit large), but not with fine accuracy.
The lions don't try and bite the humans because metal cutting your mouth hurts, but they'll do it with unarmored parts if the opportunity presents itself.
The setting for reference is a large field with a hill west and a hill east. Its pretty much a plain with two hills, about 300 yards apart.
EDIT: The Lion people are bipedal. To clarify, what weapons would be best suitable against the lion people.
The battle has 10,000 humans but 9,000 lion people. The humans do not have to travel very far to fight, but the lion people do. The lion people from their location had to travel for a week, walking, and have had a resting period of seven hours. This equates to them having a good rest.
The lion people are not a cohesive unit, so they use clubs, spears, and axes on the frontline and the females are a flanking unit.