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In page Battle of Kresna Gorge:

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After the Serbian front became static, and seeing that the Bulgarian Army in his front had already suffered defeat, King Constantine ordered the Greek Army to march further into Bulgarian territory and take the capital city of Sofia. King Constantine wanted a decisive victory on this war despite the objections of Prime Minister Eleftherios Venizelos who realized that the Serbs, having won their territorial objectives, were now trying to move the weight of the rest of the war to the Greeks by staying passive. The battle was continued for eleven days, between July 8–18, over a front of 20 km, in a maze of forests and mountains.