How to advance in the modern battlefield

[Paddington]

I`m playing one of the scenarios with germans against russians. I chose the russian side, so I`m attacking.

I`m facing leopard 2a4 tanks and milan at teams.

The map is pretty open.

So I start my advance, a bmp instantly gets hit by a milan team. Then the next one, then the... You get the point. I smoked the path that my armor force is moving trough. The milan teams are out of action beacause of the smoke. Now the leopards start smashing my tanks to pieces. I can`t see trough the smoke, they can. I advance in the north part of the map. No milans here but those damn leopards start shooting again. They are at 2200m away, but I can`t see them
Even though about 3 leopards blaze away time after time my troops don`t see a thing (no smoke here). So the germans simply kill my tanks one by one while my tanks try to spot the shooters.

So I can`t really do anything. If I advance trough the field of fire I`ll suffer horrendous losses.

I have some air forces, they can spot the german units (bug? all enemy units are visible...) But when my turn begins I can`t see sh#t.

The artillery is pretty useless cause it doesn`t have any targets.