Most land grants in the South were received as payment for military service in the Revolutionary War depending upon legth of service & rank. Privates recieved up to 640 acres, a major could expect 4,000 acres, a Brigadier General could receive up to 12,500 acres.
Maryland was an occupied state. With Habeas Corpus suspended, the Legislature was held under house arrest in Fort McHenry and not allowed to vote on a Bill of Secession. Had Virginia been quicker to sedeede, chances are good that Maryland would have also.
The property was neither abandoned nor destroyed in battle, but instead lost to taxes when a combination of Yankee pillaging and increased taxes forced the sale of most to save some. C'est la guerre.
The Missouri branch fared far less well, lost lumber mills, 600 brood mares and the stud stable, and the substantial farm. They were sent away by Union troops in a freight wagon with only the clothes on their backs. All combatants from our family fought for the Confederacy.
Any who doubt the occupied status of the State should read the words to the state song, Maryland, My Maryland. They were written by an expatriate Marylander during the war in Louisiana.
The despot's heel applies to the invasion of Northern State Militia troops which sparked rioting in Baltimore; civillians were killed. ("Avenge the patriotic gore/that flecked the streets of Baltimore")
As for parts of Maryland being considered part of Penn's Colony, the Mason-Dixon survey more or less settled that, although many will contend that a large slice of Maryland was given to Pennsylvania as a result.