Spam turrets, set up gauss hogs on the long path at the last curve, then spam hornets to kill everything else. Worked for me. Honestly you could just spam hornets entirely if you can manage fighting with them in 2+ groups.

I beat it without losing a barricade on normal. Took me a retry, though. It's the beginning stages you really need to worry about, before you can build up production and get more units out. Build turrets as quickly as possible, use the turret and ODST drop abilities, and get your beginning troops and any new ones you train up on a cliff overlooking a pathway asap. Start training hornets and nightingales as quickly as you realistically can, and ideally you'll have at least a few before the main vehicle wave. Then keep building them, making sure to upgrade air, fortification, population, etc. send them off to problem areas in groups of four or so and a nightingale. One group + Douglas in a high jacked locust and ODSTs on the very far right plateau near the very far right enemy spawn eventually held that corner, while one or two groups held the plateau with the mini-base, and one or two groups (I move a group from the mini base to here eventually) held the two plateaus right in front of the center barricade. Once banshees started coming I deployed wolverines on the two plateaus near the center barricade and in front of my base Make sure you get a warthog or hornet to scout out the map, grab the extra resources and mini base slots once you have some sort of defensive perimeter. Extra resource income or troop deployment helps.

Super easy and fun mission. Plant AV turrets all across east route and north route. Put AI turrets in some places along the northern route. Finally place AA turrets next to the first northern barricade to kill banshees. I haven't lost a barricade in the 4 times I've done this mission. It teaches you to split your forces and place your forces in areas that can't be hit with locusts or unit that can outrange you.

I guarantee the Luftwaffe Ground Forces from CoH 1 could have held that line. Shit was wonderful.

Build anti vehicle turrets everywhere on the map and siege turrets at your base. Then spam hornets, cyclopses and wolverines. Constantly use all the leader powers as well

I don't understand how people are having trouble with campaign. Shit was so easy compared to halo wars 1.