These photos illustrate the ongoing crisis in Syria

Wednesday, March 15, marks a grim anniversary for Syria: six years since the country's bloody civil war first began.

The violence in Syria has resulted in the displacement of nearly half of the country's population and an estimated 321,000 deaths since the war began in 2011. 

Below are photos of how the conflict has progressed since anti-government rebels first began clashing with Syrian President Bashar al Assad's army.

2011

Louiai Beshara/Getty Images
Karim Sahib/Getty Images
Mustafa Ozer/Getty Images
Anonymous/AP

2012

Bulent Kilic/Getty Images
Muhammed Muheisen/AP
AFP/Getty Images

2013

AFP/Getty Images
Andoni Lubaki/AP
-/Getty Images

2014

Baraa Al-Halabi/Getty Images
Mandel Ngan/Getty Images
Baraa Al-Harabi/Getty Images

2015

Abd Doumany/Getty Images
Uncredited/AP
STR/Getty Images

2016

Louai Beshara/Getty Images
Ameer Alhalbi/Getty Images
Ameer Alhalbi/Getty Images
Adem Altan/Getty Images

2017

Omar Haj Kadour/Getty Images
David Ramos/Getty Images
Joseph Eid/Getty Images