Almost all units equipped with a weapon larger than a machinegun, from 20mm automatic cannons to 150mm artillery shells, use Ammunition. The amount of ammunition a unit holds varies, but generally, they all have a limited supply which will go down as they fire that weapon. The amount of ammunition a unit has is represented by small icons above the vehicle, which will show 3, 2, or 1 bullet, or three bullet casings with a red circle indicating it is completely empty.
To rearm a vehicle, you will need to move it into Supply radius, marked by a yellow dashed circle on the map when you mouse-over a supply structure.
Of course, you can't simply resupply everything for an unlimited time. Every shell a unit gains by being resupplied takes away from your Logistics amount, so you can actually run out of ammunition for ALL of your forces, making it impossible to resupply anything. There is no way to increase the amount of Logistics you generate; your forces will receive a steady supply of Logistics, arriving in "waves" every 7.5 minutes, which will fill up your entire Logistics storage. Naturally, increasing that storage will increase the amount of Logistics you get every 5 minutes; if you only have 1000 storage, you'll only get 1000 Logistics; if you have 10000 storage, you'll get 10000 Logistics.
HQ buildings, Barracks, and all Yards (Gun, Vehicle, Tank) are able to rearm units within a certain range -- mouseover the structure and a yellow circle will appear, showing that radius. Of course, rearming at these structures means having to send your tanks way back to your base -- which is why there are several other structures specializing in resupplying.
Two of these can only be made by other units deploying into them. These units are Trucks and Supply Trucks. All Trucks can deploy into a small supply stockpile, which has a small radius. The specialized Supply Truck deploys into a large-radius supply point. The third structure is built, by Construction Vehicles -- they are Supply Depots, and have an enormous radius, and serve as a major hub for resupplying your forces on the battlefield.
Other factors play into Logistics as well. Any smallarm-equipped infantryman (such as rifle, SMG, sniper, or MG) that is in the resupply radius of a Supply source -- whether or not that unit actually has a weapon that uses ammo -- will receive a rate-of-fire boost, as their proximity to supplies allows them to "waste" more ammo.
Infantry that are not in a Supply radius will fire slower (well, fire normally) and when you are out of supplies all infantry will fire even slower regardless of being in Supply radius or not.
Hence it is important to ensure your frontline forces have ample Supplies not only so that tanks and other vehicles can re-arm their weapons but also so that your frontline infantry have readily available supplies. This generates a sort of "supply line" mechanic, a you move supplies up to keep pace with your advancements. Supply Stockpile mechanics
Above: The crossed-out ammo icon next to the tank shows it is out of ammo. Move it into the radius of the Supply cache so it can rearm.
Whenever a unit such as a tank rearms itself (as in the above picture), it will use up some of your overall Logistics amount in order to do so. The amount used depends on the weapon being rearmed -- naturally, the larger the weapon, the more Logistics it uses to replenish its ammunition. When your overall Logistics supply runs out, no units will be able to rearm, and once their ammunition is depleted it's gone for good (at least until the next wave of Logistics supplies comes).
Under normal circumstances, you will receive an additional "wave" of Logistics every 7 minutes (this is a game option that can be changed). During this 7-minute period, you will have to try your best to make due with the amount of Logistics you previously gained.
The amount of Logistics you received entirely depends on the amount of storage you've prepared for it. This is done by constructing storage structures in and around your base. Each one constructed will increase your maximum storage. Every time a Logistics Re-Supply occurs, your entire storage will be filled -- so, naturally, the more storage you have, the more Logistics you will receive at this time. This is the only way to increase your Logistics supply.
As stated, Logistics Storage is of high importance during your games, and the storage of your enemy should be attacked whenever possible to reduce the amount of Logistics they receive (and of course, the enemy will be trying to do the same to you). Logistics Storage structures, being little more than aluminum sheds filled with highly dangerous ammunition and fuel, are quite fragile structures and when destroyed they will create a rather large detonation that will destroy or damage anything nearby. While it might seem quicker and space-saving to arrange your Storage sheds into neat side-by-side lines, you will quickly find that doing so will create a chain reaction if one should explode, destroying all of them. So make sure each shed has at least a bit of distance between it and anything else.
Managing your Logistics Drain
There are several ways to make the most of your logistics (and thus saving on investing loads of command into storage structures). They are:
- Keep your infantry supplied. They fire faster!
- Use logistically-light units, such as infantry, vehicles or aircraft. Tanks are medium, while artillery uses the most logistics by far.
- Time your attacks to coincide with the resupply cycle so you can be sure that you don't spend several minutes in 'stall.'
- Avoid over-construction (units are supplied as they are built) of ammo-using units.