Both the scope and the method of the US attack on Syria's Shayrat airbase suggest that this was a punitive and limited strike intended to deter the Syrian government from using chemical weapons in the future.
The Pentagon says that the airbase that was hit - a little south-east of the city of Homs - was the location from where the aircraft that carried out this week's alleged chemical attack took off.
It says that chemical weapons are stored at the facility. The use of Tomahawk cruise missiles - a kind of arms-length strike - would have enabled an attack with great accuracy.
US warplanes and their crews did not have to encounter Russian air defences. And the number of missiles used - 59 - suggests a strike that was intended to do real damage.
The Russians, the Americans say, were informed about the strike in advance; an attempt to limit any repercussions. The target list, according to the Pentagon, rested heavily on aircraft and infrastructure. The aim was not to kill Syrian personnel but to deliver a message.
The 'anti-Obama'
This was a one-off attack to enforce deterrence against the use of chemical weapons, rather than a game-changer intended to destabilise and take-down the Assad government. So the first question is: will it succeed ?
Well, a message has clearly been delivered. There will be those who insist - like the Russians - on asserting that Syria has not used chemical weapons and was not responsible for this week's attack.
The Americans and much of the international community begs to differ. Sarin has been used before, in Syria in 2013. It crossed a "red line" drawn by President Barack Obama - but nothing happened
So this was a message to both Damascus and Moscow that there is a new man in the White House; Mr Trump is, if you like, the "anti-Obama" and they should take note.
Nerve agent - specifically Sarin - which was again used this week is a horrible weapon. President Trump in his own comments after the US strike, spoke movingly about the deaths of children in the chemical attack.
But of course children have been maimed and killed virtually every day in Syria for several years. And other chemical weapons have been used by both sides: chlorine gas by the government and mustard agent by so-called Islamic State (IS).
Is President Trump's new "red-line" going to be enforced against these attacks if repeated ?
Measured strike
There are those who have argued that it is the Trump administration's whole approach to the Syria conflict and its single-minded focus on defeating IS that may have emboldened President Assad to mount this chemical attack (though Syria has denied carrying it out).
If so, then President Assad's gamble seems to have failed, drawing a very different response than perhaps Damascus expected.
If this was a test for the Trump administration, then he seems to have risen to the challenge, using military power in a precise and proportional manner to reinforce the civilised world's long-standing antipathy to chemical weapons