Gaddafi was ready now for an offensive. The decisive offensive began in June, when a 3,000-strong GUNT force invaded Faya-Largeau, the main government stronghold in the North, which fell on 25 June. The GUNT force rapidly proceeded towards Koro Toro, Oum Chalouba, and Abéché, assuming control of the main routes towards N'Djamena. Libya, while helping with recruiting, training, and providing the GUNT with heavy artillery, only committed a few thousand regular troops to the offensive, and most of these were artillery and logistic units. This may have been due to Gaddafi's desire that the conflict be read as a Chadian internal affair.