Beachhead (noun)

A position secured on a hostile shore by an invading military force, from which further advances can be made.

Origin:

Late 19th century: from beach + head in the sense 'headland'.

Examples:

1. The troops established a beachhead and gradually advanced inland.
2. The beachhead was heavily fortified to resist counterattacks from the enemy.
3. The landing craft carried the soldiers to the beachhead, where they disembarked and formed up.
4. The beachhead was the starting point for the liberation of the country from enemy occupation.
5. The beachhead was a strategic point for the advance of the army, as it controlled the access to the interior.