I immediately regretted my claim soon after posting it, and this was the first example I had in mind, along with this counterargument. If I was to make a further (somewhat weak) counter-argument, it was engineering know-how that established the Roman Empire as a dominant military in the first place, consuming the territories of other empires. It's a safer claim that technological asymmetry permitted the conquest of the less equipped 'societies', rather than 'empires'.