Unit histories don't usually go into too much detail beyond division level. Your best bet is probably to find someone who served with G/358 who's willing to talk. The following may be of some assistance:
90th Infantry Division Association James R. Reid, Secretary-Treasurer 17 Lakeshore Drive Willowbrook, Illinois 60514-2221 (630)789-0204
90th Infantry Division Association Post Office Box 730 South Hill, Virginia 23970-0730 (800)416-9090
90th Infantry Division Association 1017 North 40th Street Fort Smith, Arkansas 72904-6932
You might also inquire as to the status of the regimental veterans association although I'm informed that overall membership has declined to the point that all three - 357th, 358th & 359th - have been disbanded.