Hi there
I take it on p59 an Inconclusive Result "a) The loser takes 1DSR per unit in the combat. .."
Means, "Each losing unit takes one DSR." (which accords with example 5 on p63) and does not mean 'take one DSR for the sum of combatant units'.
While on example 5; we have a stream, which is not introduced as a terrain type on p 21.
OK P21 is not exhaustive but p90 allows them as a player terrain choice (and they are on the set-up maps). Example 5, above tells us that streams are Rough, but are they also an obstacle as per the example of 'linear impediment' things on p 21.
P90 also has Fords as a terrain choice, is their nature described? OK they allow river or stream crossing, but is it at Open or Rough terrain, if streams are an obstacle do Fords negate this.
regards
DAvid B