It's something that would need to be wargamed out using historical knowledge (presence of U.S. Colored Troops -- always a morale-raiser for the Confederates, as at Palmitto Springs near Brownsville, Texas, in May, 1865, when Gen. Nathaniel Banks, in a display of hubris and contempt for the Texans who'd beaten him twice, landed with his Colored Troops regiments up front, enraging the Texans -- U.S. control of waterways, the sub rosa cotton-trade networks => scalawags and carpetbaggers, etc., viz., co-optation of certain RiNOid Southerners) and modern wargaming artistry. Several times (to compensate for enthusiastic Southerners, e.g., refloating their aircraft carriers like Adm. Nagumo did when he war-gamed Midway).
Gen. Lee, a few months before his death, no doubt of heart failure, did make a comment privately to a former Texas Confederate lieutenant-governor (statement sourced and cached on media) to the effect that, had he known the purposes to which the North intended to put their victory, would not have surrendered at Appomattox, but sought by any means to disperse his army, reach Bragg in Tennessee, and continue the war as a guerrilla contest.
Thus Marse Robert. I respect his judgment, while noting that heart disease does produce a certain melancholia and pessimism in sufferers.
The horrors of guerrilla warfare were well known and studied even in that era. I have read post-war comments by Marse Lee to the effect that guerrilla warfare always devolves to reprisals and atrocities, with “women and priests hiding bombs in their skirts.” Spain and the Peninsular Wars being the recent example they studied.
They knew that GW makes direct targets of noncombatants, leading to massacres of civilians, concentration camps etc. Lee felt an honorable defeat and national reconciliation was preferable to decades of dirty war, atrocities, and the much deeper national hatreds that would be developed. It’s been a few years since I read that in a CW1 history, don’t quote me!