The traditional grammar rules are:
 Use shall with I and We.
 Use will with all other Persons.
 Reverse this for emphasis:
The sea shall not have them.
Increasingly will is used across the board. Shall is by far the least common Modal Auxiliary Verb; in conversation will is used fourteen times more frequently than shall (despite the frequency that/occurs in speech). The only occasion when shall is normally used with/and we is in questions:
Shall I come with you?
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