How do you make two cats get along? That is a logical question if you have a cat and are bringing in a new one, but it also happens that, for whatever reason, two cats who have gotten along suddenly start fighting. Here is one peacemaking technique: keep the cats separated for a time, then put each in a separate cage or carrier.
Next, put them in the same room several feet apart and then feed them at the same time. Gradually, over a period of a few days, move the cages closer together at each mealtime. Eventually the two should feel more relaxed near each other, so that in time they can eat in the same room together with no aggression.
