In June Sherman's forces continued maneuvers around the northern approaches to Atlanta, and a battle ensued at Kolb's Farm on June 22, followed by Sherman's first (and only) attempt at a massive frontal assault in the Battle of Kennesaw Mountain on June 27, which Johnston strongly repulsed. However, by this time Federal forces were within 17 miles of Atlanta, threatening the city from the west and north. Johnston had yielded over 110 miles of mountainous, and thus more easily defensible, territory in just two months, while the Confederate government became increasingly frustrated and alarmed. When Johnston retreated across the Chattahoochee River, the final major barrier before Atlanta, President Davis lost his patience.