No one would guess from this description of how he grew enamoured of philosophy, that at the beginning of his arduous studies Dante took a wife. She was Gemma, the daughter of Manetto Donati, but related only distantly, if at all, to the great Corso Donati. They were married in 1292, he being twenty-seven; and in the course of the nine years that elapsed till his exile she bore him five sons and two daughters.[51] From his silence regarding her in his works, and from some words of Boccaccio's which apply only to the period of his exile, it has been inferred that the union was unhappy. But Dante makes no mention in his writings of his parents or children any more than of Gemma.[52] And why should not his wife be included among the things dearest to him which, he tells us, he had to leave behind him on his banishment? For anything we know to the contrary, their wedded life up to the time of his exile may have been happy enough; although most probably the marriage was one of convenience, and almost certainly Dante found little in Gemma's mind that answered to his own.[53] In any case it is not safe to lay stress upon his silence. During the period covered by the _Vita Nuova_ he served more than once in the field, and to this none of his earlier works make any reference. In 1289, Arezzo having warmly espoused the Ghibeline cause, the Florentines, led by Corso Donati and the great merchant Vieri dei Cerchi, took up arms and met the foe in the field of Campaldino, on the edge of the upland region of the Casentino. Dante, as a young man of means and family, fought in the vanguard;[54] and in a letter partly preserved by one of his early biographers[55] he describes himself as being then no tiro in arms, and as having with varying emotions watched the fortunes of the day. From this it is clear that he had served before, probably in an expedition into the Aretine territory made in the previous year, and referred to in the _Inferno_.[56] In the same year as Campaldino was won he was present at the surrender of Caprona, a fortress belonging to Pisa.[57] But of all this he is silent in his works, or only makes casual mention of it by way of illustration. It is, therefore, a waste of time trying to prove his domestic misery from his silence about his marriage. IV.