I cant honestly remember if we ever did have any large tank only battles (plenty of Titan only or Titan and Super Heavy Tank encounters though) but if you have done i would like pics or failing that pics of Tank armies not in battle.
If you have played a lot of Tank battles what was the largest?

Never any pure tank on tank here, though I did play a 5k game Steel Legion vs. ATML, with a list close to or the same as this one:

Regimental HQ - Infantry Support, Fire Support, Hydra
Mechanized Infantry Company - Infantry Support
Tank Company - 1 Vanq, 9 Russ, Hydra
Tank Company - 10 Russ, Hydra
Tank Company - 10 Russ, Hydra
Artillery Company - Basilisks
Sentinal Squadron
Sentinal Squadron
Super Heavy Platoon - Shadowsword
Super Heavy Platoon - Shadowsword
Super Heavy Platoon - Shadowsword

On reflection, I may have traded the Mech Inf and RHQ Infantry Support for a fourth Tank Company with Hydra. I won.

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SG

Eldar AC
Sub-Champ, Cadian Shock Troops, Mirali Skyraiders
Mankind Divided, a Dropzone Commander Blog.
Ghost's Paint Blog, where everything goes that isn't something else.

Is there a reason, why 2 of the tank companies have no vanquishers? I thought that was kind of a must have since the upgrade is free.

Just because of my collection in this case. I got one company new, but my other companies were secondhand or alternatively sourced and at the time I didn't bother to convert Vanquishers for them.

An oversight I did not repeat when I collected my Minervans.

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SG

Eldar AC
Sub-Champ, Cadian Shock Troops, Mirali Skyraiders
Mankind Divided, a Dropzone Commander Blog.
Ghost's Paint Blog, where everything goes that isn't something else.

Some time ago we played this

Not exactly a tank battle but due to table space most infantry stayed inside their transports.

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