Owen saw the difficulty with deceptae, and in his second edition referred to Livy XXII 4 4 'id tantum hostium quod ex aduerso erat conspexit; ab tergo ac super caput deceptae insidiae'.
As [5490]he that desired of his enemy now dying, to lay him with his face upward, ne amasius videret eum a tergo vulneratum, lest his sweetheart should say he was a coward.
Aliena vitia in oculis habemus; a tergo nostra sunt=--We keep the faults of others before our eyes; our own behind our backs.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "tergo" in a variety of sentences. We hope that you will now be able to make sentences using this word.