'Massing' in the Bible

Then Gideon sent through all the hill-country of Ephraim saying, Come down against Midian, and keep the ways across Jordan before they come. So all the men of Ephraim, massing themselves together, kept the ways across Jordan.

So all the people got branches, every man cutting down a branch, and they went with Abimelech at their head and, massing the branches against the inner room, put fire to the room over them; so all those who were in the tower of Shechem, about a thousand men and women, were burned to death with it.