Long ago and 200 miles away I was a student at the US Army War College at Carlisle Barracks, Pennsylvania. This arguably is the oldest post in the Army. It was a British Army post created on the Pennsylvania frontier during the Seven Years War. Just before I arrived there the War College had been so lucky as to have a Commandant who was actually a military intellectual. He fostered the study of operational theory at the strategic level and in the course of doing that, hired Michael Handel the great Israeli/American Clausewitz scholar. Handel was my faculty adviser and once we got past the usual teacher/student crap we had many grand discussions to which IMO I contributed something, anything will do in memory.
Under his guidance I undertook with a couple of others a study on "culminating points" in operations, whether tactical, operational or strategic. They are all the same thing really. The paper is linked below.
As is implied above in the blurb from operations theory, the culminating point of an offensive operation is reached when the attacking force's resources of guns, ammunition, food, fatigue and sheer spirit are outweighed by resources of the enemy that just simply are greater than yours. This is quite different from a tipping point, evidently a point at which your position begins to collapse.
If you are on "offense," you should calibrate your plan so that you reach your objective just as you reach the culminating point. If it happens that you must continue past the culminating point in order to reach your objective than you must remember that the farther out in from of your culminating point you go, the more vulnerable you are and the more subject you are to a sudden and catastrophic reversal of fortune though an attack when you are in a weakened state.
In Syria, just now, the R+6 and specifically the government aligned ground forces are spread from the Euphrates Valley to the Golan Heights Front with a lot of small commitments in between. The forces in action in the East Idlib pocket fight are finite in number. As the fight progresses they will inevitably grow weaker until there is a chance for reinforcement, rest and refit/resupply.
If they charge impetuously forward toward Idlib City a great risk will occur.
Take your time. Take your time. pl