Fall retreat / W as a single combined phase

[duffy-ocraven]

L1085-20
NIreland variant has Fall retreat / W as a single combined phase.

L3043-20
when F Retreat is a skipped phase, a "chose disband" can affect the count and thus which powers have B/D
also a consideration: "occupant at end of Fall" of any territory into which the unit(s) could retreat, is unknown at the time other powers' W orders are written.