In Unfinished Tales at the Disaster of the Gladden Fields Isildur's forces formed an effective shield wall and inflicted heavy losses on the Orcs attacking them. While I doubt this would be as effective against Rohirrim cavalry, Isildur only had 200 soldiers with him. I'm sure that with more soldiers Gondorian forces could have made a more effective, phalanx-like shield wall to defend against cavalry. However, in TTT it states(about Rohirrim cavalry) "A few of the riders appeared to be bowmen, skilled at shooting from a running horse." I have no idea how many cavalry archers were in Rohan's army, but they would be effective against large masses of infantry.
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