Heavy Artillery (HA)
DC Defense

Here are two pictures of heavy artillery fortifications. The first shows the kind of gun to which William H Yarnall might have been assigned. The second shows a sample of type of site used to protect Washington DC. Some of these types of guns were moved by train and horse-drawn devices to use in field battles.
These pictures are of men from the Massachusettes HA. W H Yarnall was with the Pennsylvania HA.

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