The most brutal military tactic in history

On August 19, 2014, ISIS uploaded a video to YouTube titled ‘A Message to America’.
The video begins with a clip of President Barack Obama’s announcement of the first United States airstrikes against ISIL. The footage then cuts to show kidnapped journalist James Foley—who had been missing for two years—kneeling beside a masked ISIL terrorist.
^James Foley beside Mohammed Emwazi before his beheading (2014). 
Foley then proceeds to read a message—scripted by his captors—claiming that his ‘real killer’ is not Islamic State, but America. He reads,
“I call on my friends, family and loved ones to rise up against my real killers—the US government—for what will happen to me is only a result of their complacent criminality [. . .] I wish I had more time. I wish I could have the hope for freedom to see my family once again.” 
Once Foley is finished speaking, his executioner—Mohammed Emwazi—threatens that any further action against ISIL from the US will be punished. Emwazi raises his knife to Foley’s throat. The footage then cuts. When it resumes once more, Foley’s decapitated corpse is shown. 
It is then revealed that ISIL is holding another American journalist—Steven Sotloff—hostage. Emwazi claims that if the airstrikes are not brought to an end, Sotloff will meet the same fate as Foley.
Despite frequent petitions from the US wider-community to call off the airstrikes against Islamic State and save Sotloff’s life, there was a drastic increase in the number of US airstrikes only days following the release of Foley’s beheading video.
On September 2, it was discovered that another video had been released to the internet by ISIS. 
Entitled ‘A Second Message to America’, the video begins with footage of Obama’s address following Foley’s beheading. Once more, the video cuts to Sotloff kneeling beside a masked terrorist (suspected to be Emwazi) reading a message from his captors.
^Steven Sotloff beside executioner before his beheading (2014). 
Sotloff speaks,
“Here you are now, Obama, nearing the end of your term and having achieved [nothing] and seemingly marching us, the American people, into a blazing fire.” 
After this speech, Sotloff is beheaded.
Media Forensic expert Jeff Smith later theorised that, though Sotloff’s beheaded body at the end of the video is real, the actual beheading depicted in the video is likely staged.
“[This] exemplifies skilled planning and premeditated nature to carry out this message to America [. . .] this isn’t the typical handicam video in a cave.” 
Following the murder, it is revealed that ISIL holds yet another prisoner—British aid worker David Haines.
United States troops were sent into Syria following Haines’ capture in an attempt to rescue him. The mission was reported to have failed because the terrorists had moved to a different location before the arrival of US ground-troops.
A video of Haines’ beheading was released on September 13, titled ‘A Message to the Allies of America’. The video followed virtually the same layout as Foley’s and Sotloff’s, and culminated with the revelation that another British aid worker was being held hostage.
^David Haines beside executioner before his beheading (2014). 
Haines’ executioner claims,
“If you, [David] Cameron, insist on fighting the Islamic State then you, like your master Obama, will have the blood of your people on your hands.” 

These are just a few examples of the atrocities committed by ISIS in response to the ‘war on terror’. Following Haines’ execution, many more beheadings took place.
And though these publicised beheadings represent only a minority of the total number of people killed by Islamic State, it still remains one of the most grisly reminders of ‘terror-marketing’ and the potential dangers of telecommunication.
The ISIS beheadings are perhaps the most brutal military tactic in history. Not because of the death-toll, but because of its sheer inhumanity.

Following James Foley’s death in 2014, his mother, Diane Foley, claimed,
"We have never been prouder of our son[,] Jim[. H]e gave his life trying to expose the world to the suffering of the Syrian people." 
And that he did.