Which preposition to use with trago

of Occurrences 3%

We concurred with him, and regretted that he had not a wider and more elevated official sphere, and gave him, withal, a trago of brandy, which he seemed greatly to relish, and then again approached the subject of sacate for our mules.

en Occurrences 1%

Si, si, es preciso saber si el objeto corresponde á tan alta pasión, añadian los otros. ¿Cuando nos reuniremos á echar un trago en la iglesia en que os alojáis?

Which preposition to use with  trago