Final answer:
The nurse has come to the square to attend a meeting with other Red Cross members.
Step-by-step explanation:
The nurse has come to the square because she is a member of the Red Cross and is attending a meeting with some forty other Red Cross members. The nurse's military uniform of dark blue with brass buttons, red collar, and red stripes indicates her affiliation with the Red Cross. The meeting may involve discussing Red Cross activities, such as making surgical dressings and comfort bags for patients.