i want to know the best ways to pass that chapter...
somebody help me !!!

Hot pursuit hard campaign... well a good combination of COs is Max/Andy in the middle, Grit on the left and Eagle/Kanbei on the right. You kind of have to rely on Grit's indirects to do the job. You might want Grit in the middle, but whatever suits you. Get rid of the minicannons with indirects, lasers then the pipeseams. Wait until you have a good force just outside of the black cannons' range. Try and build lots of the same units so that the Black Cannons' attack certain units but you still have more to get rid of the black cannons. If you are looking for a good rank, it's tough to get rid of the units near the black cannons, but I recommend you using indirects.

use max on the left and grit on the right. use sensei in he middle. excellent strategy.I ended getting an A. This strategy is better than the rest . definately dont use Jess she sux and i ended up losing because of her, max is a boss and can quickly take over w/ tanks and md tanks. grit is good just dont let them capture the base or it could be trouble. sensei needs to mech spam and use so power not super power because it is a waste. grit move inderects over to help sensei, and once max kills everyone, he needs to make bombers and KILL the cannons. Just DONT let them capture a base or itll take a while to recapture.