They were usually far ahead of the main column.

Flankers go wide on either side of the main column.

It had six main columns, and a maximum capacity of 8,000 people.

The whole top of it moved, but the main column didn't budge.

It'll take them an hour to get back to the main column.

The following links provide information on the appropriate use of each main column.

"But first we'll just have to make sure this route is clear for the main column."

"Can you find your way back to the main column?"

They have been discovered and the main column is soon under artillery fire.

She said we should shadow the main column and come to you.