2 artillary for center side. 1 for right. support the left and the right with tanks. use the third tank to flank the fortress. Have the center push though and flank left there by creating a pincer movment. right should push because of the 2 artilliry.
or you could just hold your tanks back and use the artilliry to blow everything up and send in the tanks to do clean up and assult.
whichever one you like.
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http://halowars.com/forums/thread/12738.aspx - Mods have off days too....