Glossary of terms

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H
hardtack

a hard, flat, saltless biscuit that formed part of navy or army rations
heave to

to stop moving forward, especially a ship or vessel
heliograph

an instrument with mirrors and a shutter used for sending messages in Morse code by reflecting the sun's rays
home front

the country where civilians live
howitzer

a large gun with a short barrel that fires shells high up into the air so that they drop down onto a target
humanitarian relates to the promotion of human welfare, dignity and respect