Some senior player will hide behind a hill to hunt their "pray";usually with their mate pretend shooting you.
So how to cope with this situation especially you are alone fighting against two MORAFs?

Shoot 'em

if they are hiding behind a hill in a plane then they aren't in a position to bomb your hangars. you can always wait for them to come over the hill and shoot them when they are vulnerable.

if they are hiding behind a hill in a tank you will have to go get them because they can easily take out hangars. best advice for that is to climb in altitude so you don't get a tank barrel in the face when you get over the hill.

hope this helps

Wait for reinforcements. Use the same tactic on them. The hill is great cover and you just need to be patient.

Depends on which hill. If they are in range of your hangers, you have to move more quickly. HB is correct, altitude can be your friend. Some of the players are darn good at taking your plane down with the tank. I prefer to attack the tanks from as far away as possible to avoid the big shell in the face experience. You will get to know the good tank shooters the hard way.

Listen for their shot, you can hear it. You know how long it takes to reload. Seems like the enemy always reloads twice as fast as my tank does. But as soon as you hear the shot, you are safe to attack them straight on. Prepare to evade before they reload or else you get the big shell in the face experience.

Should you encounter the tank behind the crest of a hill not in range of your hanger, focus on any enemy planes first and then the tank, from a safe distance of course.

Guys I think I know what Danny means. Some players here have no intention on trying to bomb the hangers. They will just use the hill as coverage and keep circling in front of it to get as many kills as possible until they themselves get shot down so they can now tank and get the hangers that way. Plus some players here are masters of this tactic. Not my style of play but heck, to each their own. Ohhhh it's the big hill at the allied base I am referring to.

Danny, best way to defend this is to drop your bomb if your plane has only one or drop one bomb if your plane has two. This way you get some extra speed. Ideally you do want a bomb with you so when you kill the plane you can now drop a bomb on them when they tank.

Another great option is to wait for another teammate to help you. If the player using this tactic is good at it he/she will more than likely take you down. At least when you have two or more mates going at him/her you have a good chance of geting the kill.

Try not to take the direct route over the highest peak of the hill. You are now playing into their hands by doing this. Take the route to the left where you can get around the hill and expose this player.

It's a tough situation that you brought up. Like I said I have seen some guys use this tactic that are very good at it. Just try your best!

At Vimy Ridge no such thing could happen.

Alright, so, lets say a moraf is hiding behind da hill... Kay, thats no big deal. Just land your plane behind the hill, park, and put the throttle as far as it can go without you tiping over.... The moraf will become tired of waiting and will be lured into the trap and will charge up the hill then you take the brake off and put the pedal to the medal.... Ummm well to the canvas and wood.... I mean.... He might pass you, but either make a brake for the enemy base, or turn around and fight them while they are trying to turn around or avoid crashing into the hill.

D93, I was playing BTC and no ally but only me fighting with two MORAFs. One MORAF was shooting at me far away from me. Another one was hiding behind a hill which is very close to me. I was in low altitude fighting against the one far away, but the hiding one suddenly showed up and killed me in less than 1 second.

In that situation, I don't think I could survive. The solution might be try to kill one by one.

You gotta pick one and score hits until they are dead. If you can't bomb a tank, then you have to focus on incoming planes first. 2 on one with 2 too adversaries is a tough spot!

Try to get to hilltop level or above before you reach the hill. That way you can level out and aim at them when they pop up and try to shoot you, because they might expect you to still be climbing with your guns pointing upwards.
They will see you gaining altitude through the hill, but they might be just guessing how far away you are from the hilltop.
That way you got more room to manouver sideways too to never be predictable.

being one of those "masters" of this tactic as Big guns calls us, its impossible for anyone but a really good turnfighter to take out someone like this mano a mano, because, typically, we can gauge your speed, and come up under you as you crest the hill, regardless of where on the hill you do it, its as easy to pull this on the left of the hill where the ground is lower, as it is at the peak.

The best way to counteract this, is to have two planes fly in line with each other, nose to tail, and as the first one crests the hill, they attack the hunter head on, and likely (more than likely) get killed. that guy should parachute and try to shoot the hunter while the rear of the two planes lights up the hunter who has now exposed themselves and broken cover, typicall revealing their underside to the enemy in the process of their ascending attack on the first player. use this at the highest altitude of the hill,