Scout. A cavalry scout has advantage on Wisdom (Perception) checks that rely on sight.
Mounted. Once during a cavalry scouts move, it can mount this creature as long as it is within 5 feet of the scout or they may dismount if they are already mounted. Doing so costs an amount of movement equal to half their speed. They can’t mount it if they don’t have 15 feet of movement left or if their speed is 0. If an effect moves their mount against its will while they're on it, they must succeed on a DC 10 Dexterity saving throw or fall off the mount, landing prone in a space within 5 feet of it. If they're knocked prone while mounted, they must make the same saving throw. If their mount is knocked prone, they can use your reaction to dismount it as it falls and land on their feet. Otherwise, they are dismounted and fall prone in a space within 5 feet it.
While they're mounted, they have two options. they can either control the mount or allow it to act independently. The initiative of a controlled mount changes to match theirs when they mount it. It moves as they direct it, and a controlled mount can move and act even on the turn that they mount it. If the mount provokes an opportunity attack while they're on it, the attacker can target the cavalry scout or the mount. When mounting a mount, they occupy the center-most space in the creature’s space. This means that a cavalry scout on a horse occupies the mount’s entire space.
Most cavalry scouts will ride a Warhorse.