Walkthrough: Destroy Cannons and Machine Guns at the beach using Artillery and Barrage, then deploy troops on the right side of the beach. Allow them to utilize the Machine Guns to help them hit Cannons without resistance as well as trigger Boom Mines up ahead. Once enough defenses on the right side are destroyed, use a Flare close to the HQ to allow your Grenadiers to destroy the HQ faster.
Walkthrough: Use 4 Barrages to destroy one Cannon in the line to the right of the HQ (this is the Cannon in the middle of the beach), two Cannons in the line of HQ and the first Cannon two lines to the left of HQ (that's the line with a Machine gun and 4 Cannons). Use Artillery to destroy the first cannon and a Boom Mine one line to the left of the HQ. First artillery should be shot between the Cannon and a Boom Mine and the second between a Cannon and Machine Gun in the second line to the left from the HQ. Use single shots from Artillery to destroy the second and third cannons one line to the left of the HQ. Deploy all of your troops on the far left side of the beach. Let them destroy the Machine Guns and then Flare to the left in front of the first leftmost cannon. Shock both cannons and then let the troops walk and destroy the remaining cannons on the left. Shock the remaining 3 once the troops come close. You might need to flare to the very left once more; otherwise Zookas might get hit by a machine gun and/or a cannon from the right. You may lose a couple of Heavies and/or Zookas. Medics are recommended as otherwise you may lose more Zookas.