put down

Hello,

I'd like to ask you about the meaning of put down in the excerpt bellow. I gather it should be something like "mustered" or "deployed", but I can't find this meaning in any dictionary. Is there anything wrong with my interpretation?
The excerpt is a cable from general Alexander to Winston Churchill during the battle of Montecassino.

In his reply, Alexander explained the strategic importance of Monte Cassino, but also admitted that the Allies had been surprised by the strength of the defence: “The tenacity of these German paratroops is quite remarkable, considering that they were subjected to the whole of the Mediterranean Air Force plus the better part of 800 guns under the greatest concentration of firepower which has ever been put down and lasting six hours. I doubt if there are any other troops in the world who could have stood up to it and then gone on fighting with the ferocity they have.”

Thanks in advance,
Bones

I suggest it means "laid down", which is a military way of describing the covering of an area with artillery fire

Thank you very much, Kevin. It makes perfect sense.

Bones