On 15 September , the positions of the II Bavarian Corps around Martinpuich , Le Sars and Eaucourt were severely bombarded .
Artillery units in the area encountered British tanks for the first time , as British infantry advanced from Flers , supported by about thirty aircraft .
On 15 September , the positions of the II Bavarian Corps around Martinpuich , Le Sars and Eaucourt were severely bombarded and artillery units in the area encountered British tanks for the first time , as British infantry advanced from Flers , supported by about thirty aircraft .