This is your first boss. Collect the weapons and proceed to destroy the guns on the submarine. In total there are three guns - as soon as they are destroyed, the submarine will go to the bottom.
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The left lower gun shoots heavy shells flying along the arc (hide from them under the wooden bridge), the upper weapon is the machine gun, the lower right weapon is the flamethrower (also use the bridge when the flamethrower shoots from the top down (and the submarine moves from side to side) or jump to the upper and lower levels of the bridge, if the flamethrower is conducting horizontal fire.

Focus on the lower left weapon. Destroy it as soon as possible, because the longer the fight is delayed, the higher the probability that you will be exposed to fire from all the guns. Further destroy the flamethrower, then deal with the machine gun, the shells of which are not so difficult to shy away.

As soon as the battle begins, try to kill all the usual fascists as quickly as possible. Push them into the fire pit right below. Collect ammunition and get ready for a heavy battle. Attack the booth, in which the commander-in-chief sat down. To avoid shots from the machine gun, use the top of the wooden flooring. Underneath it, hide from shells falling from above.
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Finally, yellow homing torpedoes can be destroyed from any weapon, but with the same roof they can be evaded - when collided with it, the shells explode.

After the commander-in-chief has a third of HP, he will hide himself, and the Fritz will crawl out of the windows - kill them as soon as possible, because the missiles they use are very dangerous. They will appear again after two Fritzes with shields, which I would recommend pushed into the fire.

And then it remains to finish off the commander-in-chief just as they did before.

The tank will fire at you in the same way that guns on the shores of Normandy did. Do the same, jump in time. Attack not the tank itself, but exclusively Joe, peeking out of the upper hatch. As soon as you deal with him, Joe will hide in the hatch, and the tank itself will remain invulnerable. On top of the crates fall - break them to collect ammunition.
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At the second stage (when Joe hid inside the tank), wait until the wall to the left is destroyed. Go through it, load the battle shell into the cannon and shoot into the tank. So it will be necessary to do some more times, but where to look for shells? And they drop out of boxes descending on parachutes from above. But the shells are not in all boxes, please be patient. In addition, do not delay with their destruction - if the tank is run on shells, it will disappear.

Joe will also launch a Molotov cocktail in the bunker where the gun is. Act quickly - after the shot immediately leave it.

In the third stage you will have to attack directly the tank, which will shoot at you from its main gun, try to crush and occasionally throw a fiery napalm.

Finally, you have to defeat the Darkest Don, which will be an old friend from the first part. On an easy level of complexity, the platform will be solid, and only on the sides are rotating blades. With the increase in complexity in the two hatches on the platform will appear screws, which will have to jump over.
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First, destroy the blades by attacking any of them (upper or lower). When the blades start to move in a zigzag pattern, then pick up the moment to jump under them or jump over (the latter is more difficult).

After the destruction of the blade, shoot the machine gun at the center, moving from left to right and right to left and avoiding a fiery flame. Avoiding machine-gun shots is very simple. When the machine gun is hiding, then destroy the homing missiles. Having dealt with the machine gun, shoot at the turbines that fire, not forgetting the rockets.

When they are destroyed, the second stage of the battle will begin (by the way, now in case of Willy's death you will start from this stage). Shoot the boss on a flying platform with a machine gun. Avoid machine-gun shots, which is easy enough. When he will try to scorch you with a flame, then move to the opposite edge - there will not reach the flame!

In the third stage, do everything the same, but this time there will be no more flame.

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I want to thank you (yes, yes, that's you) for the read manual, I wish you a good and happy life (and do not forget about the likes, ^ _ ^)

All that you need to click on "EVALUATE" and "IN FAVORITE" !!!
P.S. I also want to express special nobleness to Igor Patren and Showgamer channel
For the materials provided.