This conflict took place in the 1992–1993 school year in the Forbidden Forest at Hogwarts Castle. Harry Potter, Ronald Weasley and Fang fled from the Acromantula children after they told Aragog that they would be going. The Acromantulas chased them through the Forest.
Behind the scenes
In LEGO Harry Potter: Years 1-4, Harry and Ron first attack Aragog and then both the young Acromantula and Aragog chase after them.