Before the year 1857, when Mommsen published his celebrated treatise Die Rechtsfrage zwischen Caesar und dem Senat, most scholars believed that Caesar's provincial command legally expired at the end of 49 B.C.; but Mommsen demonstrated the falsity of this opinion, and for nearly half a century it was an article of faith that the date fixed was the 1st of March. I may remark parenthetically that, although this date is usually quoted, it would be more correct to say the 28th of February. In 1904, however, Otto Hirschfeld gave reasons for believing that Caesar's command was not expressly secured beyond March 1, 50; and although Ludwig Holzapfel vigorously defended the orthodox view, Hirschfeld remained for several years in possession of the field. In 1913 Walther Judeich, while admitting that Hirschfeld had worsted Mommsen, argued, ‘convincingly’ as Mr. F. E. Adcock thinks, that the date was December 29, 50. The writers of the article on Latin Literature in The Year's Work in Classical Studies (1915), noticing the reissue of the third volume of The Correspondence of Cicero, remark that ‘the authors [Tyrrell and Purser] still hold the pious faith that Caesar's command in Gaul was to run out on the 1st of March in 49; it is a pity,’ they add, ‘in view of Hirschfeld and the rest, that they have not shown the English reader their grounds for that belief.’ I propose in this article to give mine for sharing it.