The imperial German government made substantial investments in the infrastructure of Cameroon, including the extensive railways, such as the 160-metre single-span railway bridge on the southern branch of Sanaga River. However, the indigenous peoples proved reluctant to work on these projects, so the Germans instigated a harsh and unpopular system of forced labour. In fact, Jesko von Puttkamer was relieved of duty as governor of the colony due to his untoward actions toward the native Cameroonians. In 1911 at the Treaty of Fez after the Agadir Crisis, France ceded a nearly 300,000 km2 portion of the territory of French Equatorial Africa to Kamerun which became Neukamerun (New Cameroon), while Germany ceded a smaller area in the north in present-day Chad to France.