He knows that the critical minefield must he laid within the next few minutes or the mission will be a failure. He waits as long as he can, hoping that the tank will arrive. He places several anxious radio calls to the tank platoon leader. None are answered. Later he finds out that the entire tank platoon was destroyed during the initial engagement.
Time is now critical.
The platoon leader makes a desperate call to the engineer commander explaining the situation. The commander tells him that the minefield is critical and must be laid or the whole mission will fail. The platoon leader decides to move the Volcano to the minefield location and place the minefield. There is no enemy contact, and the Volcano arrives. The platoon leader verifies, with the proper authority, that he can place the Volcano.