Also, if You don't micro-manage Your units, You will lose.
Explanation:
I use only snipers and SU85s, so I'll explain microing with these 2 units.
Snipers:
Always relocate snipers from one cover to the next cover. When in cover, snipers automatically stealth out. So, if sniper shoots a bullet, and if in cover, sniper will turn invisible after a second. Don't put Your snipers in the middle of a road
Snipers have a huge pause between 2 consecutive shots. It takes about 5 seconds for a sniper to shoot the second shot. So, if Your sniper is close to an enemy unit, sniper might be flamed or granaded, therefore relocate sniper out of the range of close combat weapons. Let sniper shoot a shot then. Then relocate sniper once again, there is a 5 second window open for relocating sniper. Then let sniper stop and shoot again. If necessary -- repeat
Avoid mortar shells if You can. Shoot a shot, then relocate for 5 seconds, if You are being shelled.
Snipers are very fragile. If sniper squad is reduced to only 1 member -- retreat immediately. If 2 member sniper squad is heavily wounded -- retreat immediately.
Finally, snipers will die. But they will die with the 300% efficiency
SU85s:
SU85s have huge sight range with their far sight ability. Use it. Both SU85s and snipers shoot at huge distances. Keep them at open. If enemy closes in -- press U and retreat a tank backwards. Enemy infantry can grenade it, shrek it, button it, and so on. SU85 can shoot far, enemy infantry cannot. If too close to infantry -- back SU85 off using U backwards retreat.
If there are two enemy tanks in the field, try hiding Your tanks so that they can shoot at one enemy tank while being hidden from the other tank. Always relocate SU85s using U backwards retreat. SU85 has a strong frontal armor, but very weak rear armor.
Mark enemy vehicles with Mark Vehicle: any friendly shooting at the enemy marked vehicle will shoot faster! When enemy vehicle is marked -- make all of Your tanks shoot at it at once untill it is destroyed. Follow it if You must -- snipers will cover You!
Use automatic crew repair ability whenever is Your SU85 beneath 50%. Pull it out of combat using U backwards retreat, and when far away from a combat zone, press V to auto-repair the damaged SU85. Use it often, You don't need ammo for anything else!
Finally, if You have huge amount of ammo, let Your pioneers lay mines all over the field
Cheers :3