The lighter batteries would, in our service, be formed of six-pounder guns and twelve-pounder howitzers; and the heavier of twelve-pounder guns and twenty-four-pounder howitzers.

These heavy batteries would usually form the reserve.

Each piece being attended by its caisson, this formation would give twelve carriages to each battery, six for the guns and six for the caissons.

The extra caissons form a part of the reserve, and move with the train.

In some foreign services a battery is composed of eight pieces with their caissons.
This arm admits of three formations--_in column, in battle_, and _in battery_.