 Complete the following phrase:  In 1837 France began a blockade of the Rio de la Plata against Rosas. San Martín offered his military services to Rosas, which was declined because of San Martíns advanced age, and condemned the role of the unitarians in that conflict, as they had allied themselves with France against their own nation. San Martín bequeathed his curved saber to Rosas, because of his successful defense of the country. The conflict between France and Argentina renewed in the 