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The best leader for a Marine Rush is Captain Cutter. Check out my Halo Wars strategy.

Captain Cutter Elephant Turtle

To execute this Halo Wars strategy, your starting build order should be Supply Pad, Supply Pad, Reactor, Turret, Supply Pad, and Turret. While you are building the Supply Pads, a good Halo Wars strategy will require you to move your Warthog to collect supplies, where they can add to your much needed supplies to start your Turtle strategy. Once you have produced your second Turret, a good Halo Wars strategy will require you to build an Elephant for its’ defensive capabilities, and then a Field Armory to upgrade the Turrets. A good Halo Wars strategy will take advantage of Turrets and Elephant, their upgrades, and the infantry producing ability of the Elephant. The goal of this Halo Wars strategy is to sustain an early blow from your opponent, and quickly counter-attack while your opponent is vulnerable. Also, don’t forget to use your Disruption Bomb to fend off a Covenant Leader Rush strategy as part of your UNSC Halo Wars strategy. This Halo Wars strategy will fail if you waste too many of your resources expanding to a new base.

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