Rules of Engagement - 16pt US Infantry/Grenadiers

Hello gents
the best way to learn a set of rules - other than endlessly reading and re-reading them! - is, of course, to start having some solo practice games. Thus as my forces start to take shape I tried a 16pt aside game tonight comprising

US
1x Command Squad
2x Infantry Squads
1x LMG team
1x HMG team
1x Sherman

German
1x Command Squad
2x Infantry Squads
1x Mortar
1x PzShrek Section (split into two teams)
1x StuG IIIG

Both forces benefit from the Tactically Flexible special rule so that's 8 units for the US and 9 for the Jerries

The game opened with both forces approaching a farming town somewhere in Normandy.
The US won the strategy roll outright and ran the first and second turn, with a squad, the LMG and the HMG using the cover of the woods to screen their advance on the left flank and the Sherman leading the way with a squad in close support and the command squad following suit down the main road to town.

The Germans fanned out on either flank with the center held by the StuG and the mortar.

First two turns, nothing eventful happens.
Third turn opens and the American left's advance takes them into the woods while the US continue to charge down the road. The StuG creeps forward firing off a shot with its perfect view and scores a hit - it then penetrates the armor of the Sherman, on the hull, and scores a 1 for effect - the Sherman charges out of control with the driver disabled straight into the rear of the church and crashes into it!
As I couldn't find information about this event in the rules I reasoned there are rules for collisions between vehicles where each one adds 1d6 to its armor value (and the stone building is given the same Structural Rating as the Sherman, incidentally) and the dice-off results in one of the two suffering a penetrating hit.
Following this rationale I rolled for the Sherman impacting the church and the latter won out, so up went the Tommy Cooker in a blaze of smoke!
One nil to the Germans who score first kill.

And from then on, to this fifth turn I'm playing now, the exchanges have been quite wide apart with two dead Germans and a suppressed HMG where the .50cal opened fire on Opportunity fire on a squad of Wehrmacht soldiers moving among the buildings, killing one infantryman, and the covering MG34 returned fire scoring two kills with three hits and suppressing the HMG which failed its Discipline test and fell back.

Not looking good for Uncle Sam's finest, not one bit...