ONE bite at a time?
The Islamic State capital of Raqqa now invested in a suitable manner. American led forces [SDG/YPG] their intentions and direction of attack subject to dynamic change?
"Invest: 13. to surround (a place) with military forces or works so as to prevent approach or escape; besiege."
NO overland relief possible and NO escape possible?
Further from the latest edition of the DEBKAfile newsletter:
"Raqqa offensive slows as coalition forces split off for next anti-ISIS operation"
"With around 60 percent of Raqqa retaken from ISIS, including its old city, part of the Syrian Democratic Forces and the Kurdish YPG fighting there has been detached for the next coalition offensive building up to capture one of the jihadists' last strongholds at Abu Kamal . . . US air strikes are clearing the way for their passage."
"The operation to liberate Raqqa, the former capital of the Islamist Caliphate, billed as a key US target of the war on ISIS, is reported by our military sources to have slowed down. The US command has decided to leave a small detachment at Raqqa to finish the battle against the 2,000 jihadists still fighting inside and outside the town."
Kurdish lady soldier in operations room of SDF/YPG unit. I assume the C3I apparatus of the SDF/YPG to be crude but effective. Rube Goldberg like but adequate. You go with what you got and what you are familiar with! Personally I have the greatest admiration for those Kurdish female combatants. They put almost all men to shame!!