More secret bases. More and better unmanned warplanes. More frequent and deadly robotic attacks. Some five years after a U.S. Predator Unmanned Aerial Vehicle flew the type’s first mission over lawless Somalia, the shadowy American-led drone campaign in the Horn of Africa is targeting Islamic militants more ruthlessly than ever.

Thanks to media accounts, indirect official statements, fragmentary crash reports and one complaint by a U.N. monitoring group, we can finally begin to define — however vaguely — the scope and scale of the secret African drone war.