Pavel Jacobi born 1841 tried to introduce theories of Karl Marx, he married Varvara Alexandrovna but never served in the army.
In 1871 during the Franco-Prussian War Jacobi served as a military doctor in the Army of the Vosges led by Giuseppe Garibaldi. His wife, Zaytseva-Jacobi also served in the Army of the Vosges as a medical nurse and later left popular memoirs Among Garibaldians. 
