 Complete the following phrase:  Rome was declared the capital of Italy in March 1861, when the first Italian Parliament met in the kingdoms old capital Turin in Piedmont. However, the Italian Government could not take possession of its capital, because Napoleon III kept a French garrison in Rome protecting Pope Pius IX. By the September Convention of 1864, Napoleon III agreed to withdraw French forces from Rome in return for Italy respecting the borders of the rump Papal States. French forces were withdrawn by 1866, but their absence encouraged Garibaldi to launch a renewed attempt to take Rome and French troops returned, defeating Garibaldis expedition at the 