It was a tactical victory and allowed Cornwallis to continue his march north and achieve another series of battlefield victories before finally being stopped and surrendering at Yorktown some seven months later.
Nonetheless, the 90 minute action at Guilford Court House inflicted so many casualties on the army of Cornwallis, it helped make the eventual Yorktown victory inevitable.
Guilford CH is famous for the Brits desparately firing cannon over their own men and mowing down many of them in the process. Another “Pyrrhic victory” for the Brits.
This is also the only engagement in which the aforementioned legendary Marylanders “ran”. Strangely even more, as basically the last real battle of the war.