1 Martian 1: You want us to help you design a simulation of Martians invading Earth?
2 Ishmael: Yeah! You guys must know tons about that!
3 Ishmael: What about supply lines? You’d need to really think about those and plan carefully.
4 Martian 1: We would??

It always comes down to supply lines. Try to do anything with military force and it's always the supply lines that get you. I feel like 95% of all planning that military strategists do is all about working out how the soldiers at the front are going to get their tea and bickies.