And 'foot bridges' would not have been able to get the artillery, trains, and mounted cavalry out of Leipzig. A cavalryman without a horse is no longer a cavalryman for all practical purposes.
Small footbridges would not have helped the situation and would have been nearly useless. And the bridge being blown prematurely was the problem as the withdrawal was going well until then.
And if you're going to discuss bridge buiding and engineering, a little expertise is useful-it isn't pompous. Your 'interpretation' is ludicrous.