Star Wars: The Old Republic is an MMO so hopefully the moderator allows this.
Backstory: The Ancient Sith Empire discovers the planet Earth and the Emperor orders an attack. Led by Darth Malgus (the same Sith who attacked the Jedi Temple in the first SW:MMO), invade Earth. Believing the humans to be a push over, he only takes 5,000 war droids, 200 Sith and 4 Star Destroyers. He attacks New Mombassa first.
As soon as he enters the system, he manages to land his troops, but the entire UNSC fleet counterattacks. On the ground he is assauted by 1,000 SPARTAN-II, 1,000 ODST and 3,000 Marines all led by Master Chief. The battle in space is led by Lord Hood.
Both sides get their standard weapons. So who wins?