Please help me with these labels and postcards (French and German)

[Aegwyrt]

On the back of a picture of 10.5 cm field gun team in action:

[Prosper Vandenbroucke]

Hello Aegwyrt,
For the postcard in french language: Its to the attention of Count de Savignac and the handwritten text means (as I can read and translate):
Dear Sir
Are you able to come eating or drinking tea or coffee with me next friday in the afternoon ("Gouter" means to eat or drink something around 4 pm)
Grands et petits (Adults and children)??????
Kindly regards
but I am not able to decifer the signature (Maybe Warren)

Sorry for my poor english but's not my native language
Regards
Prosper

[nichte]

For the first two, as I read it.
Hiltraut
-----

Heinz - Löblich
Uichteritz - Weißenfels in/S. [Sachsen] Strandbad
=====

2. Geschütz, während
des Abschußes
Bray sur Somme
=====

[Aegwyrt]

Thank you both!

@Prosper Vandenbroucke Thank you for the translation. What are the two words following "...grand et petits. Mes..."?

[Prosper Vandenbroucke]

The following words are "Mes meilleurs souvenirs"

[Aegwyrt]

The following words are "Mes meilleurs souvenirs"

Thank you very much!