When you clear fort hex 51,73 move 167th, 45th, 31th to that hex and DA 51,74. Division will retreat east, so HA it with 167 and 31. Then move 45 to 52,74 and HA sec reg. Then 62 to 54,74 and 56 to 55,74 and DA Kovel.
You clear fort hex 51,73 with the first division you move. HA is sufficient. Although Pelton's notes state that to be 252. Inf.Div., I found that 292. Inf.Div can achieve this, leaving 252. free for the later move to 54,65.
Crackaces is correct to issue a caution. Pelton's opening is one of many possibilities. My thinking is that only by exploring all these possibilities can you develop your own and thereby improve your game. As the opening moves are considered so important, I like to experiment in the "Road to" scenarios and the limited "Operation Barbarossa" one before committing my forces to a campaign, in which logistics will play a very large role.