As a Mennonite and Pacifist I get nervous about the term "Army." Yet Shane uses it in a way I like. He's talking about a group of people that present a strong force. While God doesn't seem to use force an Army of lovers is the best kind of army tere could be. His sentiment below reminds of what we talk about at camp - a community of love (http://bethanybirches.org/about/vision-mission/).
An Army of Lovers (excerpt from his book: Irresistible Revelation).
Lovers are hard to come by. And I think that's what our world is desperately in need of--lovers, people who are building deep, genuine relationships with fellow strugglers along the way, and who actually know the faces of the people behind the issues they are concerned about. We are trying to raise up an army not simply of street activists but of lovers--a community of people who have fallen desperately in love with God and with suffering people, and who allow those relationships to disturb and transform them.