Is all killing wrong? After the attacks by Hamas last weekend, the Israel Defence Forces are expected to use all of their strength in a new war.
Cold furious rage of world’s deadliest army
Lethal force: The Israel Defence Forces (IDF) has 169,500 full-time soldiers and 1,650 tanks. Glossary
Hamas - A militant Palestinian organisation, which has controlled the Gaza Strip since 2007. It is listed as a terrorist organisation in the UK.
Israel - A country in the Middle East, and the only Jewish nation in the modern period. It is seen by Jews, Christians and Muslims as the Holy Land.
Gaza - The smaller of two Palestinian territories, home to two million people. It is located on the Mediterranean coast, bordered by Israel and Egypt.
Experts - Someone who knows a lot about a particular subject.