There is currently no war in progress involving Israel and the inhabitants of Gaza.
Israel
Yes they did go into war. They went into war with the greece and the rome.
No no no
Egypt and other countries declared war against Israel, which was made mostly of Jews, so, YES, but Israel did not declare war on them.
Because it is their job to report the news. They go where news is being made, in this case, Israel.
Many did, but not all.
It is a difficult question to answer. If we review ancient history, Israel was there 5 thousand years go till about year 0. In early 20th century Israeli was mainly populated by tribes of Arab nations and Israeli settlers, and in 1948 the UN declared a two countries solution in Israel for the Jewish and the Palestinians. Therefore, Israel declared independence - followed up by war declaration from most of the Arab nations around Israel and the Arab tribes living in Israel - later be called Palestinians (by the name of the place - Palestine), Israel won the war while conquering a few areas in Israel. Another reference can be made to the name "Philistines" - which is an ancient word from the bible describing invader tribes from around Israel. Philistines in biblical Hebrew means invaders. Often times, the Palestinians are identified with the Philistines since the Roman Name "Palestine" was derived from the word "Philistine".
Egypt was not at war with Israel (in a de facto sense) in 1966. Egypt was at war with Israel de jure because it did not acknowledge its Right to Exist. Egypt was preparing to invade Israel in late 1966 and early 1967. It is very likely that Egypt would have invaded in late 1967, if Israel did not launch a preventative strike to cripple the Egyptian Air Force, beginning the Six Day War.
No but the vikings went to many parts of asia/russia
They were a signatory nation of the South East Asia Treaty Organization (SEATO).
Men had to be fit and often had to go to war.