There have been only a couple of times the Muslime horde has been thrown back, for a while.
The King of Poland, Jan III Sobieski, at the Battle Vienna.
Vlad III, Prince of Wallachia, at the battle for his principality.
Ferdinand III of Castile, after the Battle of Grenada.
In all three, the tactics of the Christian commanders were simple, no Muslim was to be left alive.
They succeeded, although Fredinand, lacking sufficient troops was forced to allow the Muslime to flee and sack Spain in front of him.
Vlad was the most immediately successful, he terrorized the main Muslime army by his engagement of their large advance unit (none survived and all were impaled on stakes alongside the road) into retreat before engagement. Vlad is the basis for the Dracula legend that he lives on blood and cannot be killed. He was undone by treason, not Islam.
All three have a commonality, they were willing to immediately kill every Muslim they came in contact with, bar none.
They were simply tougher than the Muslime.
If we can't find an American this tough, well....
As for the Marxists, the people they genocided were non violent (for the most part), unarmed, imprisoned non Muslims. The Moos will be a little harder.