A common strategy suggested on the Battle Nations Forums is to use 3 Heavy Tanks with 5 Tank Killers behind them. Super Tanks work better than Heavies, but this strategy works for players who don't use Nanopods, as well.

Fire all Tank Killers who can reach the Construct first, then have a Heavy/Super tank blast the rock so the Construct moves to the front row. Then unload the rest of your Tank Killers. Once they are all reloading, finish the job with any Heavy/Super Tanks that are still alive.

This strategy has been confirmed to work if both the Heavy Tanks and the Tank Killers are rank 4 or higher. You may have to retreat if the Construct destroys a Tank Killer that hasn't fired yet, if too many Tank Killer shots miss, or if the Construct just destroys your front line too quickly.

Though the Ancient Construct can be faced at earlier levels, the most ideal time to engage the Construct is at player level 32, when Super Tanks are available to build. A Super Tank starts off with higher stats than the Heavy Tank, especially HP and Armor, which are key to this fight (565 v. 375). Also, Heavy Tanks are available at level 35, 3 levels later, during which time the Super Tank and Tank Killers can be promoted in ranks. Players who do not want to spend 210 on 3 Super Tanks should wait until they have Rank 4 or 5 Heavy Tanks.

One or two ranks are suggested for the Super Tank. The Super Tanks' primary role is to shield the Tank Killers from the Construct's Slap attack. Their other job is to blow up the front-most rock obstacle to bring the Construct into range of the rear Tank Killers. They also serve as backup damage for when the Tank Killers are all busy reloading (or destroyed).

The Tank Killers should be Rank 3 or higher, to increase their damage and chances for all shots in a volley to hit. It also ensures that they survive one slap attack at least.

Players can reduce the reliance on luck by gauging the first few attacks, starting off with the first volley of rockets from the Tank Killers. If every rocket did not hit the Construct, retreat. If the player has some patience, then retreat and repeat until each rocket hits AND one or two did critical damage.

Retreat if the Construct scores a critical hit against your units.

Now make sure the second Tank Killer's shots all hit. Retreat if they didn't. Retreat if the Construct gets "lucky" during its counterattack.

At this point, the player should not retreat and try to finish off the Construct, unless the battle goes south, mostly due to "bad luck", or "good luck" for the Construct. Use Tank Killers that are almost dead and sometimes it's better to fire with the Super Tank rather than use a suppressed Tank Killer.

By front-loading the damage and controlling the initial results (by retreating and repeating), losses can be minimized.

Set up:

The Tanks are used as meat shields, and occasionally the game ender. First, unleash your 2nd row of Tank Killer's on the Ancient Construct and when you use all three on the 2nd row, use a tank shot at the "The Rock" this opens up your last two Tank Killers, or one, for attacking. If you're using an Allied Cannoneer or a Radio Tech as a substitute, use Tank Killers.

All you need are 4 Bigfoots (preferably Rank 2+) and 3 Allied Mammoth Riders (Rank 3+). Place the Bigfoots and a Mammoth Rider in the font row and the remaining 2 in the second row (one behind the Bigfoot in the middle). In the last row you place a Radio Tech. Attack the Construct with the Mammoth Riders until you can use the Radio Tech. Occasionally a Bigfoot dies which is not a big casualty if you have a good supply of teeth and if a Mammoth Rider dies it's only Gold. You might want to destroy the Rock and attack with a Bigfoot if a Mammoth Rider dies before the Radio Tech is ready. To minimize the casualties just rank up the Bigfoots.