I have a son in Ofakim, and he told me something unbelievable: After the terrible massacre that occurred in the area, they checked the security cameras to try to see what had prevented the terrorists from going into the shul. By then it was known that the terrorists had a map of all the shuls in the city. Why did they skip over them?
The security camera from one of the shuls showed that just when everyone stood up for Shemoneh Esrei, a group of terrorists, yemach shemam, entered the courtyard outside the shul. Everyone inside was davening Shemoneh Esrei quietly, in the ezras nashim as well. The terrorists stood outside and waited, trying to hear what was going on inside. They concluded that the building was empty, and they left without harming anyone.
That is what they saw on the camera, and the simple message shouts out: See how great is the power of tefillah!