Playing a scene in Rolling Thunder. The last of four objectives is to prepare defense of a bridge against an infantry and tank assault. Started building, fought off a massive infantry wave, never saw any tanks. Built up more, waited, waited with time on fast forward, moved troops over every square foot of the territory, but am not meeting the objective. Anyone encounter this?

OK. Glitched every time I tried. I loaded the previous chapter ending and things must have juggled into a better state allowing me to complete the scenario.