Silica was acquired for use as a store ship to be used to provide general supplies at advance bases.

This became Keller's advance base for operations until February 1945.

Hades was an advance base deep in enemy territory and thus equipped with every imaginable means of security.

It can become the advance base for taking over other starships.

As you may not know, once Mars Station is up and running, she's being considered for an advance base.

"I have the report on the advance bases," Hawat said.

It said another advance base would be set up at the western end of the 16th parallel to support Government troops fighting around Zaour.

It was subsequently used as an advance base by other sledging parties.

There were no useful advance bases to support an invasion.

The Americans in their advance bases were thrown on the defensive.