 Complete the following phrase:  The legatus was officially assigned by the Senate, although it was generally only done after consulting with the magistrate in command, hoping to gather a commander and a lieuetet that could work together without trouble. This was established in order to avoid clashes of leadership like that featured by consuls Varo and Paulus in Cannae. The legatus often acted as a military consultant or adviser, like Scipio Africanus did for his brother Lucius during the 