the front of an advancing army
The advancing in rank is called a promotion. Leaders promote soldiers.
Sector
sector
Santa Anna's Army as consoliating, resupplying and recuperating from their long march and a second front was advancing along the Gulf Coast.
a cold front advancing
A warm air mass advancing under a cold air mass is called an occluded front. This occurs when a fast-moving cold front catches up to a slow-moving warm front, lifting the warm air off the ground. The mixing of air masses can lead to cloud formation and precipitation.
calvary
Vanguard
vanguards
An advancing cold front.
The row of thunderheads that builds up in front of advancing cold air is called a squall line. This line of strong thunderstorms typically forms along a cold front as warm moist air is lifted rapidly by the advancing cooler air. Squall lines can produce severe weather such as strong winds, heavy rain, and hail.
A cold front advancing