There's a fascinating story about Rav Mordechai Eliyahu ZT"L during the 1973 War.
The war was very difficult for Israel on the Egyptian front
One night, towards morning, the phone rang in the home of Rav Mordechai Eliyahu ZT"L. On the line was a phone operator. The female soldier asked, "Are you Rav Mordechai Eliyahu?" The rabbi said yes and asked how he can help. "On the line is a soldier who wants to ask an emergency operational question,". She explained that every post had a half-hour every day to communicate, and the time for this post has arrived. She asked if the rabbi would be able to take the call.
The rabbi answered positively and listened to the question. The soldier started saying, "The water situation at the post is sparse and rationed out. Due to this situation, what should I do regarding Netilat Yadayim? Wash once in the morning or wash every time I eat and go to the bathroom?"
The rabbi answered, "You are exempt - you are in a time of war - it is Piku'ah Nefesh!" The soldier then asked the rabbi, "How is it possible to refrain from Netilat Yadayim? It is very difficult for me to think about doing so. Is it possible to eat my sandwich with a napkin? I don't want to be lenient. I want to know what the halacha is in the matter."
The advice was that in the morning to wash once and make a stipulation that he is not taking his mind off [the cleanliness of his hands] for the entire day. As a result of this stipulation, he would not be required to wash before any meal. After leaving the washroom, he should wipe his hands on anything that cleans, and this will be good enough.
During this discourse, the operator who was listening in, interrupted the soldier, "Excuse me! You told me that this is an operational conversation that is related to the war. I hear that there is a regular conversation going on. This is definitely not an operational conversation."
The soldier, without batting an eye, replied, "We are speaking in codes. This is a conversation that is very important for the success of the battle..."
The rabbi understood that the soldier had gone to great lengths to make this phone call to ask this halachic question, and couldn't bring himself to hang up the phone. While the phone was still in his hands, the rabbi looked upwards and said, "Master of the universe! See what kind of soldiers You have! In such conditions, they are careful in Mitzvot - even Rabbinic Mitzvot! I beseech You, Hashem Yitbarach - save them from all evil!"
The operator, hearing the words of the rabbi, understood that they were speaking with a direct connection to HKB"H, and she asked the rabbi to bless her as well. The rabbi granted her request, and blessed her with good life and peace.
Many years after this event, Rav Mordechai Eliyahu was invited to a gathering in a school. One student asked the rabbi a question in the laws of Netilat Yadayim. The student's question was, "What do we do when there is no water in the area we are in?" The rabbi explained to him the laws about this: that one must go 4 Mil ahead and 1 Mil back in order to find water, etc. After discussing the halachot, the rabbi added the story about the soldier from that post in the Suez Canal who called him at night and asked what he was to do under war conditions.
Suddenly, one of the teachers of that school approached, with a lot of emotion and teary eyes, and told the rabbi, "I was that soldier that was there and spoke to you on the other end of the line." Afterwards, the teacher continued and described in front of the rabbi and the students who were present in the hall what occurred from the moment that telephone conversation was over. This is what the teacher said, "Immediately after the telephone conversation began heavy shelling of the post [by the Egyptians]. I was struck with amazement when opposite my eyes, an exciting vision was revealed that looked like it was a hallucination. The image of Rav Mordechai Eliyahu was revealed in the battlefield and every shell that came from the Egyptian side was moved over to the side by way of the hand of the rabbi..."
Was this connected to the insistence of carefulness about the laws of Netilat Yadayim?
The fasts on the Jewish calendar are referred to as man, woman, long, short, back, white.
Chaim Herzog (the sixth President of Israel) in an interview to Kfar Chabad magazine, told a very telling story.
The Lubavitcher Rebbe in the 80's and early 90's would stand for hours on end distributing blessings and single dollars bills to thousands. This would usually take place on Sundays right outside the Rebbe's office at 770 Eastern Parkway in Brooklyn, NY.
An engaged couple had a private audience (yechidus) with the Rebbe. In the course of the audience, the bride got emotional and motioned to her groom to leave. She then proceeded to tell the Rebbe that she was scared to get married as she had a terrible temper which she felt would ruin her upcoming marriage and she did not want to get divorced. Rebbe spoke soothingly to her by saying that she would have many children and that would have a calming effect.