What are first two stages of the invasion?

The first two stages of an invasion typically involve reconnaissance and initial assault. In the reconnaissance phase, the invading forces gather intelligence about the target area, including enemy positions and terrain features. This is followed by the initial assault, where forces launch an attack to secure key objectives, establish a foothold, and disrupt the enemy's defenses. Together, these stages set the groundwork for further military operations and deeper penetration into the territory.