This summer the Grotius Centre will host the fourth edition of the International Humanitarian Law Summer School. The course is designed by the Grotius Centre Kalshoven-Gieskes Forum on International Humanitarian Law and is organised in close cooperation with the Netherlands Red Cross. This unique programme gives a broad overview of the laws of armed conflict, and offers a range of opportunities to test the acquisition of knowledge through interactive exercises, including an exciting paintball simulation game at the end of the week. The course covers, amongst others, the classification of conflicts, protection of the civilian population, combatants and prisoners of war, the rules governing the conduct of hostilities, and the law of non-international armed conflict. The programme for the 2019 edition will be made public soon. The International Humanitarian Law in Theory and Practice Summer School offers a unique opportunity to learn from well-known and influential academics and leading practitioners from Leiden University, The Netherlands Defence Academy, the University of Amsterdam, the International Committee of the Red Cross and the Netherlands Red Cross. You will gain first-hand knowledge on the rules and laws of armed conflict in the heart of The Hague, the International City of Peace and Justice. The course also offers plenty of opportunities to network with fellow students and practitioners from all over the world. And last but not least, The Hague is a wonderful place to stay!